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@article{DE_1968_4_7_a12, author = {A. I. Perov}, title = {On the theory of multidimensional differential equations with constant coefficients}, journal = {Differencialʹnye uravneni\^a}, pages = {1289--1298}, publisher = {mathdoc}, volume = {4}, number = {7}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_7_a12/} }
A. I. Perov. On the theory of multidimensional differential equations with constant coefficients. Differencialʹnye uravneniâ, Tome 4 (1968) no. 7, pp. 1289-1298. http://geodesic.mathdoc.fr/item/DE_1968_4_7_a12/