Publications in 1999

Scientific Monographies

Heinämäki, P.: Groups of galaxies: observations of groups and simulations of post-merger interactions of supermassive black holes, Thesis, Annales Universitatis Turkuensis, serie A1, part 233, Painosalama

Refereed Articles in International Journals

Berdnikov, L.N., Chernin, A.D. : On the geometry of the Sagitarius-Carina spiral arm. - Astronomical Letters 25, 591-594

Berdyugin, A., Piirola, V. : Polarization variability in magnetic white dwarfs GD 229 and G 240-72, - Astronomy & Astrophysics 352, 619-622

Bloom, S.D., Marscher, A.P., Gear, W.K., Moore, E.M., Teräsranta, H., Valtaoja, E., Aller, H.D., Aller, M.F. : Multi-waveband observations of flat radio spectrum quasars - Astrophys. J. Suppl. 122, 1-27

Chernin, A.D. : Spiral arms with straight segments - Monthly Notices of Royal Astronomical Society 308, 321-332

Chernin, A.D. : Star complexes and rows in giant spirals - Astronomy and Astrophysics Trans. 18, 393-402

Chernin, A.D., Dolgachev, V.P. : Dark matter in free-fall triplets of galaxies - Astronomy and Astrophysics Transactions 18, 67-72.

Chernin, A. : Rows of star complexes - Astronomy & Astrophysics. Transactions 16, 652-661

Dubus G., Charles P.A., Long K., Hakala P.J., Kuulkers E. : The eclipsing X-ray pulsar X-7 in M33 - Monthly Notices of Royal Astronomical Society 302, 731

Ekholm T., Lanoix P., Teerikorpi P., Paturel G., Fouqu P. : "Investigations of the Local Supercluster Velocity Field II. A study using Tolman-Bondi solution and galaxies with accurate distances from the Cepheid PL-relation" - Astronomy and Astrophysics 351, 827-833

Ekholm T., Teerikorpi P., Theureau G., Hanski M., Paturel G., Bottinelli L., Gouguenheim L. : "Kinematics of the local universe X: Ho from the inverse B-band Tully-Fisher relation using diameter and magnitude limited samples" - Astronomy and Astrophysics 347, 99-111

Falomo,R., Kotilainen, J.K. : Optical imaging of the host galaxies of X-ray selected BL Lac objects - Astronomy & Astrophysics 352, 85 - 102:

Gliozzi,M., Brinkman, W., Laurent-Muehleisen, S.A., Takalo, L.O., Sillanpää, A. : ROSAT HRI observatins of radio-loud AGN - Astronomy & Astrophysics, 352, 437

Gyuk, G. , Flynn, C. & Evans, N. W. : Star Counts and the Warped and Flaring Milky Way Disk - Astrophysical Journal 521, 190

Hakala P.J., Muhli P., Dubus G. : Evidence for evolving accretion disk structure in 4U 957+115 - Monthly Notices of Royal Astronomical Society 306, 701

Harrop-Allin M.K., Hakala P.J., Cropper, M. : Indirect imaging of the accretion stream in eclipsing polars - I. Method and tests Monthly Notices of Royal Astronomical Society 302, 362

Harrop-Allin M.K., Cropper M., Hakala P.J., Hellier C., Ramseyer T. : Indirect imaging of the accretion stream in eclipsing polars II: HU Aquarii - Monthly Notices of Royal Astronomical Society 308, 807

Heidt, J., Nilsson K., Sillanpää A., Takalo L.O., Pursimo T. : High-resolution imaging of Einstein Slew Survey BL Lacertae objects - Astronomy & Astrophysics 341, 683-692

Heidt, J., Nilsson, K., Appenzeller, I., Jäger, K., Seifert, W., Szeifert, T., Gässler, W., Häfner, R., Hummel, W., Muschielok, B., Nicklas, H., Stahl. O. : Observations of the host galaxies of the BL Lacertae objects H 0414+009 and OJ 287 with FORS1 at VLT-UT1 - Astronomy & Astrophysics 352, L11-16

Heidt. J., Nilsson, K., Fried, J.W., Takalo, L.O., Sillanpää, A., Pursimo, T. : 1ES 1741+196: A BL Lacertae object in a triplet of interacting galaxies - Astronomy & Astrophysics 348, 113

Heinämäki, P., Lehto, H.J., Valtonen, M.J., Chernin, A.D: : Chaos in three-body dynamics: Kolmogorov-Sinai entropy - Monthly Notices of Royal Astronomical Society 310, 811-822

Holmberg, J., Lindegren, L. & Flynn, C. : Towards An Improved Model of the Galaxy - Highlights in Astronomy , 11, 570

Lainela, M., Takalo, L. O., Sillanpää, A., Pursimo, T., Nilsson, K., Katajainen, S., Tosti, G., Fiorucci, M., Luciani, M., Villata, M., Raiteri, C. M., De Francesco, G., Sorbito, G., Benitez, E., Dultzin-Hacyan, D., De Diego, J. A., Turner, G. W., Robertson, J. W., Honeycutt, R. K., : The 65 day period in 3C 66A during bright state. - Astrophysical Journal 521: 561-564

Lähteenmäki, A., Valtaoja, E. : Optical polarization and imaging of radio galaxies - Astron. J. 117, 1168-1174

Lähteenmäki, A., Valtaoja, E. : Total flux density variations in extragalactic radio sources. III. Doppler boosting factors for different classes of radio sources - Astrophys. J. 521, 493-501

Lähteenmäki, A., Valtaoja, E., Wiik, K. : Total flux density variations in extragalacic radio sources. II. Determining the limiting brightness temperature for synchrotron sources - Astrophysical Journal 511, 112 117

Massaro, E., Maesano, M., Montagni, F., Nesci, R., Tosti, G., Fiorucci, M., Luciani, M., Takalo, L.O., Sillanpää, A., Katajainen, S., Keinänen, P., Pursimo, T., Villata, M., Raiteri, C. M., De Francesco, G., Sorbito, G., Efimov, Y. S., Shakhovskoy, N. M., : The extraordinary optical outburst of ON 231 (W COM) in the spring 1998, Astronomy & Astrophysics, 342, L49 L52

Mikkola, S. & Innanen, K. 1999: Symplectic Tangent Map for Planetary Motions - Celestial Mechanics and Dynamical Astronomy 74, 59-67.

Mikkola, S. & Tanikawa, K. : Algoritmic regularization of the few-body problem - Monthly Notices of the Royal Astronomical Society, 310, 745-749.

Mikkola, S. & Tanikawa, K. : Explicit symplectic algorithms for time-transformed Hamiltonians - Celestial Mechanics and Dynamical Astronomy, 74, 287-295.

Mikkola, S. : Efficient symplectic integration of satellite orbits. - Celestial Mechanics and Dynamical Astronomy 74, 275-285.

Mukherjee, R., Böttcher, M., Hartman, R.C., Sreekumar, P., Thompson, D.J., Mahoney, W.A., Pursimo, T., Sillanpää, A., Takalo, L.O. : Broadband spectral analysis of PKS 0528+134: A report on six years of EGRET Observations - Astrophysical Journal 527, 132

Nilsson K., Takalo L.O., Pursimo T., Sillanpää A., Heidt, J., Wagner, S.J., Laurent-Muehleisen, S.A., Brinkmann, W. : Discovery of a blue arc near the BL Lacertae object RGB 1745+398 - Astronomy & Astrophysics 343, 81

Nilsson, K., Pursimo, T., Takalo, L.O., Sillanpää, A., Pietilä, H., Heidt, J. : Two-dimensional photometric decomposition of the TeV BL Lacertae objects Mkn 421, Mkn 501 and 1ES 2344+514 - PASP 111, 1223

Nurmi, P., Valtonen, M. J., Zheng, J. Q., Mikkola, S., Rickman, H. : Monte Carlo Simulations of Oort Cloud Comets: the Influence of Mantle Blow-off on the Inclination Distribution of Jupiter Family - Earth Moon and Planets, 77, 239-244.

Pietilä, H., Takalo, L. O., Tosti, G., Benitez, E., Chiattelli, B., Corradi, R. L. M., Cox, G., De Diego, J. A., De Francesce, G., Dulzin-Hacyan, D., Heinämäki, P., Katajainen, S., Keinänen, P., Korhonen, H., Kotilainen, J., Lainela, M., Licandro, J., Luciani, M., Nilsson, K., Pursimo T., Raiteri, C. M., Rekola, R., Sillanpää A., Sorbito, G., Teräsranta, H., Villata, M., Zurita, A. : OJ 287 and the predicted fade of 1998 - Astronomy & Astrophysics 345, 760-768

Pursimo, T., Nilsson, K., Teerikorpi, P., Kopylov A, Soboleva N., Parijskij Yu., Baryshev Yu., Verkhodanov O., Temirova A., Zhelenkova O., Goss W., Sillanpää A., Takalo L.O. : "Optical morphology of distant RATAN-600 radio galaxies from subarcsecond resolution NOT images" - Astronomy and Astrophysics Supplement Series 134, 505-521

Raiteri, C.M., Villata, M., Tosti, G., Fiorucci, M., Ghisellini, G., Takalo, L.O., Sillanpää. A., Valtaoja, E., Teräsranta, H., Tornikoski,M., Aller, M.F., Aller, H.D., De Francesco, G., Heinämäki, P., Katajainen, S., Lanteri, L., Nilsson, K., Pursimo,T., Rizzi, N., Sobrito, G., : Optical and radio behaviour of the blazar S4 0954+65. - Astronomy and Astrophysics: 352, 19-31

Reynolds A., Parmar A.N., Hakala P.J., Pollock A.M.T., Williams O.R., Peacock A., Taylor B.G. : The EXOSAT Medium-Energy Slew Survey Catalogue - Astronomy and Astrophysics Supplement series 134, 287

Sokolov, V. V., Zharikov, S. V., Baryshev, Yu. V.; Hanski, M. O., Nilsson, K., Teerikorpi, P., Nicastro, L., Palazzi, E. : Properties of the host galaxy of the gamma-ray burst 970508 and local star-forming galaxies - Astronomy and Astrophysics 344, 43-50

Takalo, L.O., Pursimo, T., Sillanpää, A. Hanski, M., Heinämäki, P., Katajainen, S., Lainela, M., Nilsson, K., Nurmi, P., Pietilä, H., Rekola, R., Riehokainen, A., Valtaoja, E., Aller, M., Aller, H., Hughes, P., Benitez, E., de Diego, J.A., Dultzin-Hacyan, D., Cavallone, M., de Francesco, G., Lanteri, L., Raiteri, C.M., Sobrito, G., Villata, M., Efimov, Y., Shakhovskoy, N., Tosti, G., Fiorucci, M., Nucciarelli, G., Maesano, M., Massaro, E., Montagni, F., Nesci, R., D'Alessio, F., Honeycutt, R.K., Robertson, J.W., Turner, G.W., Teräsranta, H., Tornikoski, M., Boltwood, P., Sadun, A., Poyner, G. . Radio and Optical Monitoring of 3C 66A during an extended outburst. II. 1995-1997 - Blazar Data: 1, 6

Teerikorpi P., Ekholm T., Hanski M.O., Theureau G. : Theoretical aspects of the inverse Tully-Fisher relation as a distance indicator: incompleteness in logVmax, the relevant slope, and the calibrator sample bias - Astronomy and Astrophysics 343, 713-719

Tosti, G., Fiorucci, M., Luciani, M., Maesano, M., Massaro, E., Montagni, F., Nesci, R., Villata, M., Raiteri, C.M., de Francesco, G., Sobrito, G., Takalo, L.O., Sillanpää, A., Katajainen, S., Pursimo, T. : The Light curve of ON 231 (W Com) during the spring 1998 outburst - Blazar Data 1, 4

Tosti, G., Luciani, M., Fiorucci, M., Maesano, M., Massaro, E., Montagni, F., Nesci, R., Kurtanidze, O., Nikolashvili, M., Natriashvili, V., Butikashvili, L., Takalo, L. O., Sillanpää, A., Katajainen, S., Keinänen, P., Nilsson, K., : The Optical Light curve of BL Lacertae during the 1997 outburst. - Blazar Data: 2, 1

Valtaoja, E., Lähteenmäki, A., Teräsranta, H., Lainela, M. : Total flux density variations in extragalactic radio sources. I. Decomposition of variations into exponential flares. - Astrophys. J. Suppl. 120, 95

Valtonen, M.J. : Jets, Hot spots and Sidedness in Double Radio Sources in the Slingshot Theory. - The Astrophysical Journal 520: 97 104

Valtonen, M.J., Lehto, H.J., Pietilä, H., : Probing the jet on the binary black hole model of the quasar OJ 287 - Astronomy and Astrophysics, 342, L29-L31

Wilhelm, R. , Beers, T. C., Sommer-Larsen, J. , Pier, J. R., Layden, A. C., Flynn, C. , Rossi, S. & Christensen, P. R. : Spectroscopy of Hot Stars in the Galactic Halo. III. Analysis of a Large Sample of Field Horizontal-Branch and Other A-Type Stars - Astronomical Journal, 117, 2329

Zheng, J.Q., & Valtonen, M.J. : On the probability that a comet that has escaped from another solar system will collide with the earth - Monthly Notices of Royal Astronomical Society 304: 579-582.

Refereed Articles in International Edited Works and Conference Proceedings

Andersen, M., Piirola, V., Andersen, J., Lindberg, B. : Wide field imaging at the NOT; The CCD mosaic camera and the Focal Reducer (FRed), - In Astrophysics with the NOT, Karttunen, H., Piirola, V. (eds.), University of Turku, 23-28

Chernin, A.D : Ancient concepts of time. - In Ancient Astronomy: The Sky and The Man, ed. E.N. Kaurov, MSU, Moscow, 266-270.

Chernin, A.D. : Chaos in three-body dynamics. - In Impact of Modern Dynamics in Astronomy (IAU Coll. 172), editors J. Henrard and S. Ferras-Mello, Kluwer Academic Publishers, Dordreht, 465-466.

Chernin, A.D. : Giant spirals in the Friedmann Universe. - In Alexander Friedmann International Seminar on Gravitation and Cosmology, eds. Yu.N. Gnedin et al., Campinas, SP: Unicamp/IMECC, Mexico, 1999, 46-52.

Flynn, C. , Gould, A. & Bahcall, J. : Faint Stars Counts with HST. - The Third Stromlo Symposium: The Galactic Halo, eds. Gibson, B.K., Axelrod, T.S. & Putman, M.E. - ASP Conference Series Vol. 165, p. 387

Hagen-Thorn, V.A., Marchenko, S.G., Takalo, L.O., Sillanpää, A., Pursimo, T. : Analysis of the colour variations of 3C66A in the optical region during 1993-1997., - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää, PASP, vol. 159, 111-114

Hagen-Thorn, V.A., Chernin A.D. : Extragalactic astronomy. - In The History of Astronomy in Russia and the USSR, ed. V.V. Sobolev, Moscow, Janus-K, pp. 341-375

Hakala, P.J. : NOT observations of X-ray binaries - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 175-182

Harrop-Allin M.K., Cropper M., Hakala P.J., Hellier C., Ramseyer T. : Indirect imaging of the accretion stream in HU Aquarii - Proc. of Annapolis workshop on magnetic CV's., ASP Conf. series, 157, 81

Heinämäki, P., Takalo, L.O, Sillanpää, A., Nilsson, K., Pursimo, T. : Snapshot images of BL Lacs from the NOT. - in BL Lac Phenomenon, eds. L. O. Takalo and A. Sillanpää, PASP 159, 409

Karttunen, H. Piirola, V. (eds.) : Astrophysics with the NOT - University of Turku, 283 pp.

Katajainen S., Piirola V., Lehto, H. J. : UBVRI-photopolarimetric observations and data modelling of BY Cam (H0538+608). - In Astrophysics with the NOT, Karttunen, H., Piirola, V. (eds.), University of Turku, p. 183-186

Katajainen S., Scaltriti, F., Anderluzzi, E., Piirola, V., Lehto, H. J. : UBVRI polarimetry of the long period AM Her type Cataclysmic Variable RX J0515.6+0105. - In Astrophysics with the NOT, Karttunen, H., Piirola, V. (eds.), University of Turku, p. 194-197

Katajainen, S., Takalo, L. O., Sillanpää, A., Hanski, M., Heinämäki, P., Kotoneva, E., Lainela, M., Nilsson, K., Nurmi, P., Pietilä, H., Pursimo, T., Rekola, R., Riehokainen, A., : The Tuorla Optical Quasar Monitoring Program - In Takalo, L. O., Sillanpää, A., (eds.) BL Lac Phenomenon, A.S.P. Conf. Ser., 159, 87-90

Kotilainen, J.K. : Seyfert galaxies at the NOT - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 130-133

Kotilainen, J.K., Falomo,R., Scarpa,R. : The host galaxies of BL Lac objects in the nearinfrared - In The BL Lac Phenomenon (ed. L.O.Takalo, A.Sillanpää) - ASP Conference Series 159, 399 - 404

Kovalev, Y.Y., Teräsranta, H., Tornikoski, M., Valtaoja, E. : A strong flare in the BL Lacertae object 0235+164 at 1-230 GHz in 1997-1998 - BL Lac Phenomenon, eds. L. O. Takalo and A. Sillanpää, PASP Conference Series 159, San Francisco, p. 65-66

Lehto, H. J., Katajainen, S., Piirola, V. : Wavelet analysis of BY Cam (H0538+608) lightcurves. - In Astrophysics with the NOT, Karttunen, H., Piirola, V. (eds.), University of Turku, p. 198-201

Lähteenmäki, A., Valtaoja, E. : Comparison of radio and EGRET gamma-ray properties between BL Lacs and other AGN - BL Lac Phenomenon, eds. L. O. Takalo and A. Sillanpää, PASP Conference Series 159, San Francisco, p. 213-216

Marchenko, S., Hagen-Thorn, V.A., Yakoleva, V.A., Sillanpää, A., Takalo, L.O. : Two methods of time series analysis and their application to the optical light curves of OJ 287 and 3C66A - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää, PASP, vol. 159, 265

Nilsson, K., Pursimo, T., Takalo, L.O., Sillanpää, A., Pietilä, H., Heidt, J., , Two-deimensional photometric decomposition of four TeV BL Lacertae objects - in "OJ-94 Annual meeting 1999", eds. C.M. Raiteri, M. Villata and L.O. Takalo ,Osservatorio Astronomico di Torino, 57

Nilsson, K., Takalo, L.O, Pursimo, T., Sillanpää, A., Heidt, J. : High resolution optical imaging of TeV BL Lacertae objects - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää - PASP, vol. 159, 405

Nilsson, K., Takalo, L.O., Pursimo, T., Sillanpää, A., Heidt, J., Wagner, S.J., Laurent-Muechleisen, S.A., Brinkman, W. : Discovery of blue arc near the BL Lacertae object RGB 1745+398, - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 134-137

Palmer, P.L., Hashida,Y., Aarseth,S.J. & Mikkola, S. : Comparative Stydy of a Suite of Highly Efficient Orbit Propagation Methods, proceedings of 9th International Astronautical Congress, 1998.

Piirola, V. 1999: Polarimetry at the NOT (invited review). - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 63-70

Piirola, V., Scaltriti, F., Coyne, G.V. : Imaging polarimetry of star forming regions. - In Astrophysics with the NOT, H. Karttunen and V. Piirola (eds.), University of Turku, p. 167-171 D]

Piironen, J., Muinonen, K., Virtanen, J., Keranen, S., Warell, J., Festin, L., Piirola, V., Karttunen, H., Korhonen, H., Aspin, C., Andersen, M., Harrop-Allin., K. : Polarimetry and astrometry of asteroids at the NOT, - In Astrophysics with the NOT, Karttunen, H., Piirola, V. (eds.), University of Turku, p. 269-273

Potter, S.B., Cropper, M., Hakala, P.J. : The GOSSIP on the MCV V347 Pav - Proc. of Annapolis workshop on magnetic CV's. - ASP Conference series 157, 253

Pursimo T., Nilsson K., Teerikorpi P., Kopylov A., Soboleva N., Parijskij Yu., Baryshev Yu., Verhodanov O., Temirova A., Zhelenkova O., Goss W., Sillanpää A., Takalo L.O. : Optical morphology of distant RATAN-600 radio galaxies - in Radioastronomical Researches, Proceedings of the VIII Russian-Finnish Symposium on Radioastronomy, eds. V.V. Zaitsev, A.V. Stepanov, Central Astronomical Observatory Russian Academy of Sciences

Pursimo, T., Nilsson, K., Heinämäki, P., Katajainen, S., Sillanpää, A., Takalo, L.O, Laurent-Muehleisen, S., Brinkman, W. : Polarimetric identification of the RGB BL Lac candidates - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää - PASP, volume 159, 515

Pursimo, T., Nilsson, K., Heinämäki, P., Katajainen, S., Sillanpää, A., Takalo, L.O, Smith, P.S., Schmidt, G., Laurent-Muehleisen, S.A., Brinkmann, W. : Polarity of RGB BL Lacs - in Astrophysics with the NOT, eds. Hannu Karttunen and Vilppu Piirola, University of Turku, 126-129

Pursimo, T., Nilsson, K., Sillanpää, A., Takalo, L.O, Heidt, J. : Deep imaging of 1 Jy BL Lacs- MgII absorbers - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää - PASP, volume 159, 385

Pursimo, T., Takalo, L.O., Sillanpää, A., Nilsson, K., Laurent-Muehleisen, S.A., Brinkmann, W., : RGB BL Lacs, a new sample of BL Lac objects - in "OJ-94 Annual meeting 1999", eds. C.M. Raiteri, M. Villata and L.O. Takalo, Osservatorio Astronomico di Torino, 103

Ramsay G., Cropper M., Mason K.O., Hakala P.J. : The optical counterpart of the double degenerate polar RXJ1914+24 - Proc. of Annapolis workshop on magnetic CV's. - ASP Conference series 157, 153

Riehokainen, A., Urpo, S., Valtaoja, E., Makarov, V.I., Makarova, V., Tlatov, A.G. : Connections between the polar faculae and redio bright areas in the polar zones of the Sun - Proceedings of the VIII Russian-Finish Symposium on Radioastronomy, June 28 July 3, Russian Academy of Sciences, pp. 44-49

Sillanpää, A. : The OJ287 supermassive binary black hole model and the new unified scheme for the AGNs - in "Observational evidence for black holes in the Universe", edited S. Chakrabarti, Kluwer Publishing, 209 214

Sillanpää, A., Takalo, L.O., Nilsson, K., Pursimo, T., Pietilä, H., Heidt, J. : NOT and HST images of BL lac objects in comparison - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää - PASP, vol. 159, 395

Sillanpää, A., Takalo, L.O., Nilsson, K., Pursimo, T., Heinämäki, P. : NOT imaging of BL Lac objects, - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 113-119

Takalo, L.O. . Intensive monitoring of OJ 287 and 3C66A - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää PASP 159, 253-256

Takalo, L.O. : Blaxar monitoring at the NOT, - In Astrophysics with the NOT, Karttunen, H. and Piirola, V. (eds.), University of Turku, p. 120-125

Theureau G., Hanski M., Ekholm T., Bottinelli L., Gouguenheim L., Paturel G., Teerikorpi P. : "The Value of Ho from the TF Diameter Relation" - in Cosmological Parameters and Evolution of the Universe, Ed. Katsuhiko Sato (Dordrecht, Boston: Kluwer Academic, Proceedings of the 183rd symposium of the International Astronomical Union held in Kyoto, Japan, August 18-22, 1997), 71 - 73

Teräsranta, H., Tornikoski, M., Valtaoja, E. : Long term continuum monitoring of AGN with the Metsähovi and SEST telescopes - BL Lac Phenomenon, eds. L. O. Takalo and A. Sillanpää, PASP Conference Series 159, San Francisco, p. 41-44

Tosti, G., Luciani, M., Fiorucci, M., Massaro, E., Nesci, R., Maesano, M., Montagni, F., Villata, M., Raiteri, C. M., De Francesco, G., Sobrito, G., Takalo, L. O., Sillanpää, A., Katajainen, S., Pursimo, T., Kurtanidze, O.M., Nikolashvili, M. G., : Optical behaviour of BL Lacertae during the great 1997 outburst - Memorie della Societa Astronomica Italiana 70: 237-241

Tosti, G., Luciani, M., Massaro, E., Nesci, R., Maesano, M., Montagni, F., Villata, M., Raiteri, C.M., De Francesco, G., Sobrito, G., Takalo, L.O., Sillanpää, A., Katajainen, S., Pursimo, T., Kurtanidze, O., Nikolashvili, M. : Optical monitoring of BL Lac in 1997-1998 - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää PASP 159, 145

Tosti, G., Luciani, M., Massaro, E., Nesci, R., Maesano, M., Montagni, F., Villata, M., Raiteri, C.M., De Francesco, G., Sobrito, G., Takalo, L.O., Sillanpää, A., Katajainen, S., Pursimo, T., Efimov, YU., Shakhovskoy, N.M. : What is happening in W Com (ON 231)? the extraordinary 1998 outburst - in "BL Lac Phenomenon", eds. L. O. Takalo and A. Sillanpää - PASP 159, 149

Valtaoja, E., Lähteenmäki, A., Teräsranta, H., Lainela, M. : Doppler boosting and orientation effects in BL Lacs and other AGN - BL Lac Phenomenon, eds. L. O. Takalo and A. Sillanpää - PASP Conference Series 159, San Francisco, p. 477-482

Valtaoja, E., Wiik, K. : AGN shocks as cosmological standard rods - Second Millimeter - VLBI Science Workshop, IRAM Granada, Spain, May 27-29 1999.

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