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@article{DE_1976_12_6_a7, author = {M. V. Fedoryuk}, title = {An adiabatic invariant of a system of linear oscillators, and scattering theory}, journal = {Differencialʹnye uravneni\^a}, pages = {1012--1018}, publisher = {mathdoc}, volume = {12}, number = {6}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_6_a7/} }
M. V. Fedoryuk. An adiabatic invariant of a system of linear oscillators, and scattering theory. Differencialʹnye uravneniâ, Tome 12 (1976) no. 6, pp. 1012-1018. http://geodesic.mathdoc.fr/item/DE_1976_12_6_a7/