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@article{DAN_1965_161_1_a4, author = {R. V. Gamkrelidze}, title = {A contribution to the first variation theory}, journal = {Doklady Akademii Nauk}, pages = {23--26}, publisher = {mathdoc}, volume = {161}, number = {1}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_1_a4/} }
R. V. Gamkrelidze. A contribution to the first variation theory. Doklady Akademii Nauk, Tome 161 (1965) no. 1, pp. 23-26. http://geodesic.mathdoc.fr/item/DAN_1965_161_1_a4/