Sachs, R. K. 1932- General relativity for mathematicians R. K. Sachs, H. Wu - New York : Springer-Verlag, 1977 - xii, 291 p. : ill. ; 24 cm. - Graduate texts in mathematics ; 48 . Bibliography: p. 274-276 ISBN: 038790218X LCCN: 76-047697 Subjects--Topical Terms: Relativity (Physics)