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@article{DE_1971_7_10_a7, author = {V. N. Laptinskii}, title = {A certain matrix method in the theory of oscillations}, journal = {Differencialʹnye uravneni\^a}, pages = {1819--1824}, publisher = {mathdoc}, volume = {7}, number = {10}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a7/} }
V. N. Laptinskii. A certain matrix method in the theory of oscillations. Differencialʹnye uravneniâ, Tome 7 (1971) no. 10, pp. 1819-1824. http://geodesic.mathdoc.fr/item/DE_1971_7_10_a7/