Phys. Rev. D 37, 1406–1409 (1988)On theories of gravitation with nonlinear LagrangiansReceived 23 June 1987; published in the issue dated 15 March 1988 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. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.37.1406
DOI:
10.1103/PhysRevD.37.1406
PACS:
04.20.Fy, 04.50.+h
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