General relativity and cosmology : proceedings /
edited by Rainer Kurt Sachs
- New York : Academic Press, 1971
- 387 p. : ill., group port. ; 26 cm.
- Its Proceedings, course 47 .
At head of title: Italian Physical Society Added t.p. in Italian, with title: Relativita generale e cosmologia Course held June 30-July 12, 1969