1. Benedict, G.F. and Shelus, P.J. 1978, in IAU Colloquium #48,Modern Astrometry, ed. Prochazka, F.V. and Tucker, R.H. (: Institute of Astronomy (University Observatory), Vienna, Austria )
2. Boiko, V.N. 1975,Soviet Astronomy,19, 261.
3. Branham, R.L. 1979,Astron. J.,84, 1399, 1402.
4. Branham, R.L. 1980Astronomical Papers of the AENA, XXI pt 3.
5. Brouwer, D. 1935, Astron. J., No. 1022, 57