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@article{DAN_1962_145_4_a3, author = {V. F. Gaposhkin}, title = {On the critical-point principle in {Banach} spaces}, journal = {Doklady Akademii Nauk}, pages = {716--719}, publisher = {mathdoc}, volume = {145}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a3/} }
V. F. Gaposhkin. On the critical-point principle in Banach spaces. Doklady Akademii Nauk, Tome 145 (1962) no. 4, pp. 716-719. http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a3/