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@article{DAN_1960_130_3_a3, author = {V. I. Matsaev}, title = {The existence of transformation operators for differential equations of higher order}, journal = {Doklady Akademii Nauk}, pages = {499--502}, publisher = {mathdoc}, volume = {130}, number = {3}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a3/} }
V. I. Matsaev. The existence of transformation operators for differential equations of higher order. Doklady Akademii Nauk, Tome 130 (1960) no. 3, pp. 499-502. http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a3/