Instabilities in luminous early type stars : proceedings of a workshop in honour of Professor Cees de Jager on the occasion of his 65th birthday, held in Lunteren, the Netherlands, 21-24 April 1986 - Jager, C. de (Cornelis), 1921-; Lamers, Henny J. G. L. M., 1941-; Loore, Camiel W. H. de (Astrophysics and space science library, 1987)