1. The Yale-San Juan Southern Proper Motion Program (SPM)
2. Morrison L.V. , Argyle R.W. , Requième Y , Helmer L. , Fabricius C. , Einicke O.H. , Buontempo M.E. , Muinos J.L. , Rapaport M. : 1990. Astron. Astrophys. (in press)
3. Anderson B. , Argue A.N. , Argyle R.W. , Davis R. , Morrison L.V. , Wilkinson P.N. , 1989.: private communication
4. De Vegt C. , Johnston K.J. , Florkowski D. : 1990, this Colloquium