In the 1970s Hendrik van Dam and Martinus J. G. Veltman[REF] and, independently, Valentin I. Zakharov[REF] discovered a peculiar property of Fierz-Pauli massive gravity: its predictions do not uniformly reduce to those of general relativity in the limit m\to0.
It was argued by Vainshtein[REF] two years later that the vDVZ discontinuity is an artifact of the linear theory, and that the predictions of general relativity are in fact recovered at small scales when one takes into account nonlinear effects, i.e., higher than quadratic terms in h_{\mu\nu}.