@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/}
}