1
Global Structure and Evolution in General Relativity [E-Book] : Proceedings of the First Samos Meeting on Cosmology, Geometry and Relativity held at Karlovassi, Samos, Greece, 5–7 September 1994 /
2
Gravitational Lenses [E-Book] : Proceedings of a Conference Held in Hamburg, Germany 9–13 September 1991 /