References

• Allen D.A., et al., 1985, ApJS 59, 513 NASA ADS
• Antonucci R.R.J., Ulvestod J.J.S., 1985, ApJ 294, 158 NASA ADS
• Baath L.B., Zhang F.J., 1990, in compact steep-spectrum and GHz-peaked spectrum Radio Sources, Fanti C., Fanti R., O'Dea C.P. & Schilizzi R.T. (eds.) Consighio Nazinale delle Riccerche: Istituto di Radioastronomia-Bologna, p. 147
• Bregman J.N., et al., 1984, ApJ 276, 454 NASA ADS
• Brindle G., et al., 1986, MNRAS 221, 739 NASA ADS
• Buridge G., Hewitt A., 1987, AJ 92, 1 NASA ADS
• Carswell R.F., et al., 1974, ApJ 190, L101 NASA ADS
• Horiuchi T., Kato S., 1990, PASJ 42, 661 NASA ADS
• Jurkevich I.N., 1971, Ap&SS 13, 154
• Kidger M.R., Yakalo L., Sillanpaa A., 1992, A&A 264, 32 NASA ADS
• Kidger M.R., 1989, A&A 226, 9 NASA ADS
• Liu F.K., Xie G.Z., Bai J.M., 1995, A&A 295, 1 NASA ADS
• Lu P.K., 1972, ApJ 77, 829
• McGimsey B.Q., et al., 1975, AJ 80, 895 NASA ADS
• Meyer F., Meyer-Hofmeister E., 1984, A&A 132, 143 NASA ADS
• Miller H.R., 1983, AJ 88, 1301 NASA ADS
• Moles M., Garcia-Pelayo J.M., Masegosa J., Aparicio A., 1985, ApJS 58, 253
• O'Dell S.L., Pushell J.J., Stein W.A., Warner J.W., 1978, ApJS 38, 267 NASA ADS
• Pollock J.T., et al., 1979, AJ 84, 1658 NASA ADS
• Pollock J.T., 1975, ApJ 198, L53 NASA ADS
• Porcas R.W., 1987, in Superluminal Radio Sources, p. 12
• Smith A.G., Leacock R.J., Webb, 1987a, Lect. Notes Phys. 307, p. 158
• Smith P.S., Balonek T., Elston R., Heckert P.A., 1987, ApJS 64, 459 NASA ADS
• Sillanpaa A., et al., 1996, A&A 305, L17 NASA ADS
• Sillanpaa A., et al., 1988a, ApJ 325, 628 NASA ADS
• Sillanpaa A., et al., 1988b, A&AS 72, 347 NASA ADS
• Stevens J.A., Litchfield S.L., Roboson E.I., et al., 1994, ApJ 437, 91 NASA ADS
• Takalo L.O. Sillanpaa A., Nilsson K., et al., 1992, A&AS 94, 37 NASA ADS
• Takalo L.O., 1991, A&AS 90, 161 NASA ADS
• Tanzi E.G., et al., 1989, in BL Lac Objects, Maraschi L., Maccacaro T., Ulrich M.-H. (eds.). Springer-Verlag, Heidelberg, p. 171
• Terasranta H., et al., 1992, A&AS 94, 121 NASA ADS
• Terasranta H, et al., 1991, in Variability of Blazars, Valtaoja E. and Valtonen M. (eds.). Cambridge Univ. Press, p. 159
• Ulvestad J.S., Johnston K.J., 1984, AJ 89, 189 NASA ADS
• Valtaoja L., Karttunen H., Valtaoja E., et al., 1993, A&A 273, 393 NASA ADS
• Valtaoja L., Valtaoja E., Shakhovskoy N.M., et al., 1991, AJ 102, 1946 NASA ADS
• Wardle J.F.C., Robert D.H., 1988, IAU 129, p. 143
• Webb J.R., Smith A.G., Leacock R.J., et al., 1988, AJ 95, 374 NASA ADS
• Wing R.F., 1973, AJ 78, 684 NASA ADS
• Worrall D.M., et al., 1981, ApJ 243, 53 NASA ADS
• Xie G.Z., et al., 1997 (in preparation)
• Xie G.Z., et al., 1994, A&AS 106, 361 NASA ADS
• Xie G.Z., et al., 1992, ApJS 80, 683 NASA ADS
• Xie G.Z., et al., 1990, A&A 229, 329 NASA ADS
• Xie G.Z., et al., 1988, A&AS 72, 163 NASA ADS
• Xie G.Z., et al., 1987, A&AS 67, 17 NASA ADS
• Zekl H., et al., 1981, A&A 103, 342
• Zhang F.J., et al., in Variability of Blazars, Valtaoja E. and Valtonen M. (eds.). Cambridge Univ. Press, p. 234