Michio Kaku
Charles W. Misner
Arthur Stanley Eddington
Robert M. Wald
Philip D. Mannheim
Prabhakar Gondhalekar
International School of Physics "Enrico Fermi" (1972 July 17-29 Varenna, Italy)
Jayant Vishnu Narlikar
Abhay Ashtekar
William C. Saslaw
V. L. Poli͡achenko
V. B. Braginskiĭ
International School of Physics 'Enrico Fermi' (67th 1976 Varenna)
International Conference on General Relativity and Gravitation (12th 1989 University of Colorado)
International Conference on General Relativity and Gravitation (11th 1986 Stockholm)
W. Israel
William J. Kaufmann
Peter Gabriel Bergmann
Igor D. Novikov
Conference on Differential Geometric Methods in Theoretical Physics (1981 International Centre for Theoretical Physics)