Media type: E-Article Title: Essential Relativity: Special, General, and Cosmological Contributor: Rindler, Wolfgang; Ohanian, Hans C. Published: American Association of Physics Teachers (AAPT), 1977 Published in: American Journal of Physics, 45 (1977) 12, Seite 1235-1235 Language: English DOI: 10.1119/1.10693 ISSN: 0002-9505; 1943-2909 Origination: Footnote: