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@article{IVM_1968_8_a8, author = {I. Yu. Ryzhakov}, title = {The problem of finding the characteristic set in certain special cases}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {63--72}, publisher = {mathdoc}, number = {8}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_8_a8/} }
I. Yu. Ryzhakov. The problem of finding the characteristic set in certain special cases. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1968), pp. 63-72. http://geodesic.mathdoc.fr/item/IVM_1968_8_a8/