@article{IVM_1978_5_a12,
     author = {I. I. Ryabcev},
     title = {Operational calculus in terms of perfect operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {103--113},
     publisher = {mathdoc},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_5_a12/}
}