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@article{DAN_1961_139_6_a4, author = {S. G. Krein and Yu. I. Petunin}, title = {A relationship criterion for two {Banach} spaces}, journal = {Doklady Akademii Nauk}, pages = {1295--1298}, publisher = {mathdoc}, volume = {139}, number = {6}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_6_a4/} }
S. G. Krein; Yu. I. Petunin. A relationship criterion for two Banach spaces. Doklady Akademii Nauk, Tome 139 (1961) no. 6, pp. 1295-1298. http://geodesic.mathdoc.fr/item/DAN_1961_139_6_a4/