References for the numbering systems

Col	Reference

--- ---------

R1 Mavers F.W. 1940, Astr. Abh. Hambourg Bergedorf V no 4

R2 Ebbighausen E.G. 1940, Astrophys. J. 92, 434

R3 Lavdovski V.V. 1961, Trudy Glav. Astr. Obs. Pulkovo 73, 1

R4 McNamara B.J., Sanders W.L. 1977, Astron. Astrophys. Suppl. 30, 45

R5 Artjukhina N.M., Kalininia E.P. 1970, Trudy St. Astr. Inst. 40, 3

R6 Platais I. 1984, Pis'ma Astron. Zh. 10, 203

R7 Glushkova E.V. 1992, Sov. Astron. 35, 466


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