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@article{DE_1981_17_12_a1, author = {V. Ya. Derr}, title = {On the question of factorization of a linear boundary value problem}, journal = {Differencialʹnye uravneni\^a}, pages = {2123--2135}, publisher = {mathdoc}, volume = {17}, number = {12}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1981_17_12_a1/} }
V. Ya. Derr. On the question of factorization of a linear boundary value problem. Differencialʹnye uravneniâ, Tome 17 (1981) no. 12, pp. 2123-2135. http://geodesic.mathdoc.fr/item/DE_1981_17_12_a1/