Papapetrou, A. (1948). Einstein's theory of gravitation and flat space.
Lua i Stíl Chicago (17ú heag.)Papapetrou, A. Einstein's Theory of Gravitation and Flat Space. 1948.
Lua MLA (9ú heag.)Papapetrou, A. Einstein's Theory of Gravitation and Flat Space. 1948.
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