EINSTEIN, Albert, & Leopold Infeld.

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On the Motion of Particles in General Relativity Theory. First edition, offprint issue. Einstein and Infeld demonstrate that "field equations alone suffice as a basis for solving the problem of motion in general relativistic theory, since the Einstein equations not only determine how particles must respond to gravitational forces, but also contain the information necessary to describe those forces" (Calaprice, p. 323).

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