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@article{IVM_1971_6_a12, author = {G. V. Chirkov}, title = {A~left-semiperfect ring that is not left-$f$-perfect}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {102--110}, publisher = {mathdoc}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1971_6_a12/} }
G. V. Chirkov. A~left-semiperfect ring that is not left-$f$-perfect. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1971), pp. 102-110. http://geodesic.mathdoc.fr/item/IVM_1971_6_a12/