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@article{IVM_1975_8_a2, author = {A. N. Veissenberg}, title = {The use of approximation in the study of critical cases}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {17--18}, publisher = {mathdoc}, number = {8}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1975_8_a2/} }
A. N. Veissenberg. The use of approximation in the study of critical cases. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1975), pp. 17-18. http://geodesic.mathdoc.fr/item/IVM_1975_8_a2/