Freundlich, Erwin, 1885-1964
The foundations of Einstein's theory of gravitation / by Erwin Freundlich ; authorised English translation by Henry L. Brose ; preface by Albert Einstein ; introduction by H.H. Turner.
Einstein, Albert, 1879-1955
Gravitation
Relativity (Physics)
1922.
Brose, Henry L. (Henry Leopold), 1890-