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@article{DAN_1963_149_2_a23, author = {I. G. Fikhtengol'ts}, title = {Einstein's tensor of the fourth rank}, journal = {Doklady Akademii Nauk}, pages = {308--311}, publisher = {mathdoc}, volume = {149}, number = {2}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_2_a23/} }
I. G. Fikhtengol'ts. Einstein's tensor of the fourth rank. Doklady Akademii Nauk, Tome 149 (1963) no. 2, pp. 308-311. http://geodesic.mathdoc.fr/item/DAN_1963_149_2_a23/