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

Physics of Luminous Blue Variables: Proceedings of the 113th Colloquium of the International Astronomical Union, Held at Val Morin, Quebec Province, Canada, August 15–18, 1988