1 Feb 1996 / Proc. "The Fifth Mexico-Texas Conference on Astrophysics: Gaseous Nebulae and Star Formation", Rev. Mex. Astr. Ap. Ser. Conf. 3, 61 (1995)
1 Feb 1996 / Proc. "The Fifth Mexico-Texas Conference on Astrophysics: Gaseous Nebulae and Star Formation", Rev. Mex. Astr. Ap. Ser. Conf. 3, 105 (1995)