1 C.J. Butler, J.. Doyle, A.D. Andrews, P.B. Byrne, J.L. Linsky, P.L. Bornmann, M.. Rodono, V.. Passani, and T.. Simon, Astronomy and Astrophysics 174, (1987).
1 J.L. Linsky, P.L. Bornmann, H.. Rodondo, V.. Passani, A.D. Andrews, C.J. Butler, and P.B. Byrne, in (1982).