@article{DAN_1991_317_2_a3,
     author = {M. M. Vinogradov},
     title = {On a general algebraic theory of linear differential operators. {I}},
     journal = {Doklady Akademii Nauk},
     pages = {275--279},
     year = {1991},
     volume = {317},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a3/}
}