@article{IVM_1976_8_a10,
     author = {V. G. Tsirulik and F. A. Brusentsev},
     title = {The equivalence of the properties of commutative factorizability and reducibility of linear differential operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {81--84},
     publisher = {mathdoc},
     number = {8},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_8_a10/}
}