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@article{DAN_1983_271_5_a11, author = {M. M. Khapaev}, title = {A.\,N.~Tikhonov's theorem for singularly perturbed systems}, journal = {Doklady Akademii Nauk}, pages = {1074--1077}, publisher = {mathdoc}, volume = {271}, number = {5}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_271_5_a11/} }
M. M. Khapaev. A.\,N.~Tikhonov's theorem for singularly perturbed systems. Doklady Akademii Nauk, Tome 271 (1983) no. 5, pp. 1074-1077. http://geodesic.mathdoc.fr/item/DAN_1983_271_5_a11/