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