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@article{IVM_1968_9_a2, author = {B. G. Gabdulkhaev}, title = {Some questions of the theory of approximate {methods.~I}}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {16--28}, publisher = {mathdoc}, number = {9}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_9_a2/} }
B. G. Gabdulkhaev. Some questions of the theory of approximate methods.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1968), pp. 16-28. http://geodesic.mathdoc.fr/item/IVM_1968_9_a2/