Linsky J.L., J.E. Neff, A. Brown, B.D. Gross, T. Simon, A.D. Andrews, M. Rodono, and P. Feldman, Astronomy And Astrophysics 211, 173\textendash186 (1989).
Brown A., M.V. Penston, R. Johnstone, C. Jordan, N.P.M. Kuin, M.T.V.T. Lago, B.D. Gross, and J.L. Linsky, in (NASA, 1984).
and 
