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It is shown that any theory of gravitation with a nonlinear Lagrangian depending on the Ricci tensor is equivalent to the Einstein theory of gravitation interacting with additional matter fields.Received 23 June 1987DOI:https://doi.org/10.1103/PhysRevD.37.1406©1988 American Physical Society
Jakubiec et al. (Tue,) studied this question.
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