%0 Journal Article
%T Nonlinear Lagrangians of the Ricci type
%A Andrzej Borowiec
%J Physics
%D 1999
%I arXiv
%X The Euler-Lagrange equations for some class of gravitational actions are calculated by means of Palatini principle. Polynomial structures with Einstein metrics appear among extremals of this variational problem.
%U http://arxiv.org/abs/gr-qc/9906043v1