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@article{MZM_1981_30_2_a9, author = {M. M. Vinogradov}, title = {Extensions of fields and extensions of linear differential operators}, journal = {Matemati\v{c}eskie zametki}, pages = {237--248}, publisher = {mathdoc}, volume = {30}, number = {2}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_2_a9/} }
M. M. Vinogradov. Extensions of fields and extensions of linear differential operators. Matematičeskie zametki, Tome 30 (1981) no. 2, pp. 237-248. http://geodesic.mathdoc.fr/item/MZM_1981_30_2_a9/