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@article{DAN_1967_176_5_a5, author = {M. A. Krasnosel'skii and E. A. Livshitz}, title = {Duality principles for boundary value problems}, journal = {Doklady Akademii Nauk}, pages = {999--1001}, publisher = {mathdoc}, volume = {176}, number = {5}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_5_a5/} }
M. A. Krasnosel'skii; E. A. Livshitz. Duality principles for boundary value problems. Doklady Akademii Nauk, Tome 176 (1967) no. 5, pp. 999-1001. http://geodesic.mathdoc.fr/item/DAN_1967_176_5_a5/