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@article{DAN_1962_142_6_a5, author = {R. S. Ismagilov}, title = {Self-adjointness conditions of higher-order differential operators}, journal = {Doklady Akademii Nauk}, pages = {1239--1242}, publisher = {mathdoc}, volume = {142}, number = {6}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_6_a5/} }
R. S. Ismagilov. Self-adjointness conditions of higher-order differential operators. Doklady Akademii Nauk, Tome 142 (1962) no. 6, pp. 1239-1242. http://geodesic.mathdoc.fr/item/DAN_1962_142_6_a5/