References

• Barbieri C., Romano G., di Serego A. S., Zambon M., 1977, A&A 59, 419 NASA ADS
• Biermann P.L., Kühr H., Snyder W.A., Zensus J.A., 1987, A&A 185, 9 NASA ADS
• Blom J.J., Bloemen H., Bennett K., et al., 1995, A&A 295 330 NASA ADS
• Bloom S.D., Marscher A.P., 1991, ApJ 366 16 NASA ADS
• Bolton J.G., Wall J.V., 1970, Aust. J. Phys. 23 789 NASA ADS
• Bosio S., De Francesco G., Ghisellini G., et al., 1995, IAU Circ. 6183
• Bozyan E.P., Hemenway P.D., Argue A.N., 1990, AJ 99, 1421 NASA ADS
• Bregman J.N., Glassgold A.E., Huggins P.J., et al., 1986, ApJ 301, 708 NASA ADS
• Brown L.M.J., Robson E.I., Gear W.K., et al., 1989, ApJ 340, 129 NASA ADS
• Browne I.W.A., Murphy D.W., 1987, MNRAS 226, 601 NASA ADS
• Browne I.W.A., Perley R.A., 1986, MNRAS 222, 149 NASA ADS
• Buckley J., Quinn J., Weekes T.C., et al., 1995, IAU Circ. 6167
• Cohen A.M., Porcas R.W., Browne I.W.A., Daintree E.J., Walsh D., 1977, Mem. R. Astron. Soc. 84, 1
• Collmar W., et al., 1994, in: The Second Compton Symposium, Fichtel C.E., Geherels N., Norris J.P. (eds.). AIP, New York, p. 659
• Condon J.J., Hicks P.D., Jauncey D.L., 1977, AJ 82, 692 NASA ADS
• Corso G.J., Ringwald F., Schultz J., Harris R., Mikolajczyk D., 1988, PASP 100, 70 NASA ADS
• Craine E.R., 1977, A handbook of quasistellar and BL Lacertae objects. Pachart, Tucson
• Dermer C.D., Schlickeiser R., 1993, ApJ 416, 458 NASA ADS
• Dondi L., Ghisellini G., 1995, MNRAS 273, 583 NASA ADS
• Elvis M., Lockman F.J., Wilkes B.J., 1989, AJ 97, 777 NASA ADS
• Falomo R., Scarpa R., Bersanelli M., 1994, ApJS 93, 125 NASA ADS
• Fejes I., Porcas R.W., Akujor C.E., 1992, A&A 257, 459 NASA ADS
• Fichtel C.E., Bertsch D.L., Chiang J., et al., 1994, ApJS 94, 551 NASA ADS
• Fiorucci M., Tosti G., et al., 1996, A&A (in preparation)
• Gear W.K., Stevens J.A., Hughes D.H., et al., 1994, MNRAS 267, 167 NASA ADS
• Ghisellini G., Villata M., Raiteri C.M., et al., 1996, A&A (in preparation)
• Gregory P.C., Condon J.J., 1991, ApJS 75, 1011 NASA ADS
• Grueff G., Vigotti M., 1972, A&AS 6, 1
• Hartman R.C., Bertsch D.L., Fichtel C.E., et al., 1992, IAU Circ. 5477
• Hazard C., Gulkis S., Sutton J., 1968, ApJ 154, 413 NASA ADS
• Hewitt A., Burbidge G., 1987, ApJS 63, 1 NASA ADS
• Hunter S.D., Bertsch D.L., Dingus B.L., et al., 1993, ApJ 409, 134 NASA ADS
• Hurst G.M., 1992, IAU Circ. 5471
• Impey C.D., Tapia S., 1990, ApJ 354, 124 NASA ADS
• Johnson W.N., Dermer C.D., Kinzer R.L., et al., 1995, ApJ 445, 182 NASA ADS
• Kerrick A.D., Akerlof C.W., Biller S.D., et al., 1995, ApJ 438, L59 NASA ADS
• Kidger M., Takalo L., 1990, A&A 239, L9 NASA ADS
• Kidger M.R., de Diego J.A., 1990, A&A 227, L25 NASA ADS
• Kinman T.D., 1976, ApJ 205, 1 NASA ADS
• Kühr H., 1977, A&AS 29, 139 NASA ADS
• Kühr H., Schmidt G.D., 1990, AJ 99, 1 NASA ADS
• Kühr H., Witzel A., Pauliny-Toth I.I.K., Nauber U., 1981, A&AS 45, 367 NASA ADS
• Kühr H., Johnston K.J., Odenwald S., Adlhoch J., 1987, A&AS 71, 493 NASA ADS
• Landolt A.U., 1992, AJ 104, 340 NASA ADS
• Latini G., Bosio S., De Francesco G., et al., 1996, in: Extragalactic radio sources. Kluwer, Dordrecht (in press)
• Ledden J.E., O'Dell S.L., 1985, ApJ 298, 630 NASA ADS
• Liller M.H., Liller W., 1975, ApJ 199, L133 NASA ADS
• Lloyd C., 1984, MNRAS 209, 697 NASA ADS
• Makino K., 1989, in: Proc. 23rd ESLAB Symp.. ESA, p. 803
• Malaguti G., Bassani L., Caroli E., 1994, ApJS 94, 517 NASA ADS
• Maoz D., Bahcall J.N., Doxsey R., et al., 1993, ApJ 402, 69 NASA ADS
• Maraschi L., Ghisellini G., Tanzi E.G., Treves A., 1986, ApJ 310, 325 NASA ADS
• Maraschi L., Ghisellini G., Celotti A., 1992, ApJ 397, L5 NASA ADS
• Massaro E., Nesci R., Maesano M., et al., 1996, A&A (in press)
• Mattox J.R., Bertsch D.L., Chiang J., et al., 1993, ApJ 410, 609 NASA ADS
• Miller H.R., 1975, ApJ 201, L109 NASA ADS
• Miller H.R., Mullikin T.L., McGimsey B.Q., 1983, AJ 88, 1301 NASA ADS
• Netzer H., Kazanas D., Baldwin J.A., Ferland G.J., Browne I.W.A., 1994, ApJ 430, 191 NASA ADS
• Pauliny-Toth I.I.K., Preuss E., Witzel A., et al., 1973, A&A 27, 475
• Penston M.J., Penston M.V., Sandage A., 1971, PASP 83, 783 NASA ADS
• Penston M.V., Cannon R.D., 1970, Bull. Royal Obs. 19, 159
• Perley R.A., 1982, AJ 87, 859 NASA ADS
• Pian E., Treves A., 1993, ApJ 416, 130 NASA ADS
• Pica A.J., 1977, AJ 82, 935 NASA ADS
• Pica A.J., Smith A.G., Webb J.R., et al., 1988, AJ 96, 1215 NASA ADS
• Raiteri C.M., Ghisellini G., Villata M., et al., 1996, in: Extragalactic radio sources. Kluwer, Dordrecht (in press)
• Sadun A.C., 1985, PASP 97, 395 NASA ADS
• Sambruna R.M., Barr P., Giommi P., et al., 1994, ApJS 95, 371 NASA ADS
• Sandage A., Wyndham J.D., 1965, ApJ 141, 328
• Scaltriti F., Piirola V., Cellino A., et al., 1989, Mem. Soc. Astron. Ital. 60, 243
• Schramm K.-J., Borgeest U., Camenzind M., et al., 1993, A&A 278, 391 NASA ADS
• Schramm K.-J., Borgeest U., Kühl D., et al., 1994, A&AS 106, 349 NASA ADS
• Shimmins A.J., Bolton J.G., Wall J.V., 1975, Aust. J. Phys. Astrophys. Suppl. 34, 63
• Sikora M., Begelman M.C., Rees M.J., 1994, ApJ 421, 153 NASA ADS
• Sillanpää A., Haarala S., Korhonen T., 1988, A&AS 72, 347 NASA ADS
• Sillanpää A., Mikkola S., Valtaoja L., 1991, A&AS 88, 225 NASA ADS
• Sillanpää A., Takalo L.O., Pursimo T., et al., 1996, A&A 305, L17 NASA ADS
• Smith A.G., Nair A.D., Leacock R.J., Clements S.D., 1993, AJ 105, 437 NASA ADS
• Smith P.S., Balonek T.J., Heckert P.A., Elston R., Schmidt G.D., 1985, AJ 90, 1184 NASA ADS
• Steidel C.C., Sargent W.L.W., 1991, ApJ 382, 433 NASA ADS
• Stickel M., Meisenheimer K., Kühr H., 1994, A&AS 105, 211 NASA ADS
• Stockman H.S., 1978, in: Pittsburg conference on BL Lac objects. University of Pittsburg, Pittsburg, p. 149
• Takahashi T., Makino F., Kii T., et al., 1995, IAU Circ. 6167
• Takalo L.O., Sillanpää A., Pursimo T., et al., 1996a, A&AS (in press)
• Takalo L.O., Sillanpää A., Lehto H.J., et al., 1996b, A&AS (submitted)
• Thompson D.J., Bertsch D.L., Dingus B.L., et al., 1993, ApJ 415, L13 NASA ADS
• Thompson D.J., Bertsch D.L., Dingus B.L., et al., 1994, in: Multi-wavelength continuum emission of AGN, Courvoisier T.J.-L., Blecha A. (eds.). Kluwer, Dordrecht, p. 49
• Thompson D.J., Bertsch D.L., Dingus B.L., et al., 1995, ApJS 101, 259 NASA ADS
• Tornikoski M., Valtaoja E., Teräsranta H., et al., 1994, A&A 289, 673 NASA ADS
• Tosti G., Fiorucci M., et al., 1996, A&A (in preparation)
• Ulrich M.H., Boksenberg A., Bromage G., et al., 1980, MNRAS 192, 561 NASA ADS
• Unwin S.C., Cohen M.H., Biretta J.A., et al., 1985, ApJ 289, 109 NASA ADS
• Valtaoja L., Karttunen H., Efimov Y., Shakhovskoy N.M., 1993, A&A 278, 371 NASA ADS
• Véron P., Véron M.P., 1975, A&A 39, 281 NASA ADS
• Véron-Cetty M.-P., Véron P., 1987, A catalogue of quasars and active nuclei. ESO, Garching bei München
• Villata M., Raiteri C.M., Ghisellini G., et al., 1996, in: Workshop on two years of intensive monitoring of OJ 287 and 3C 66A, Takalo L.O. (ed.). Tuorla Observatory, Piikkiö, Finland, p. 110
• von Linde J., Borgeest U., Schramm K.-J., et al., 1993, A&A 267, L23 NASA ADS
• von Montigny C., et al., 1993, in: Compton Gamma-Ray Observatory, Geherels N., Friedlander M. (eds.). AIP, New York, p. 518
• von Montigny C., Bertsch D.L., Chiang J., et al., 1995, ApJ 440, 525 NASA ADS
• Wagner S., Sanchez-Pons F., Quirrenbach A., Witzel A., 1990, A&A 235, L1 NASA ADS
• Wagner S.J., Camenzind M., Dreissigacker O., et al., 1995, A&A 298, 688 NASA ADS
• Wall J.V., Peacock J.A., 1985, MNRAS 216, 173 NASA ADS
• Webb J.R., Smith A.G., Leacock R.J., et al., 1988, AJ 95, 374 NASA ADS
• Webb J.R., Carini M.T., Clements S., et al., 1990, AJ 100, 1452 NASA ADS
• Webb J.R., Shrader C.R., Balonek T.J., et al., 1994, ApJ 422, 570 NASA ADS
• Webb J.R., Barnello T., Robson I., Hartman R.C., 1995, IAU Circ. 6168

• Wilkes B.J., Tananbaum H., Worrall D.M., et al., 1994, ApJS 92, 53 NASA ADS
• Wills B.J., Pollock J.T., Aller H.D., et al., 1983, ApJ 274, 62 NASA ADS
• Wills B.J., Wills D., Breger M., Antonucci R.R.J., Barvainis R., 1992, ApJ 398, 454 NASA ADS
• Wills D., Wills B.J., 1976, ApJS 31, 143 NASA ADS
• Worrall D.M., Wilkes B.J., 1990, ApJ 360, 396 NASA ADS
• Xie G.Z., Lu R.W., Zhou Y., et al., 1988, A&AS 72, 163 NASA ADS
• Xie G.Z., Li K.H., Zhang Y.H., et al., 1994, A&AS 106, 361 NASA ADS
• Zhang Y.F., Marscher A.P., Aller H.D., et al., 1994, ApJ 432, 91 NASA ADS