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@article{DAN_1995_342_1_a9, author = {O. A. Godin}, title = {An adiabatic invariant for acoustic modes in a nonhomogeneous}, journal = {Doklady Akademii Nauk}, pages = {36--39}, publisher = {mathdoc}, volume = {342}, number = {1}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1995_342_1_a9/} }
O. A. Godin. An adiabatic invariant for acoustic modes in a nonhomogeneous. Doklady Akademii Nauk, Tome 342 (1995) no. 1, pp. 36-39. http://geodesic.mathdoc.fr/item/DAN_1995_342_1_a9/