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@article{DAN_1967_177_6_a13, author = {A. M. Ermolaev}, title = {Perturbation theory for the expansion coefficients of two-electron wave function}, journal = {Doklady Akademii Nauk}, pages = {1302--1305}, publisher = {mathdoc}, volume = {177}, number = {6}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a13/} }
A. M. Ermolaev. Perturbation theory for the expansion coefficients of two-electron wave function. Doklady Akademii Nauk, Tome 177 (1967) no. 6, pp. 1302-1305. http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a13/