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@article{DAN_1990_310_5_a13, author = {O. A. Godin}, title = {Estimates for phase and group velocities of acoustic normal waves}, journal = {Doklady Akademii Nauk}, pages = {1084--1089}, publisher = {mathdoc}, volume = {310}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_5_a13/} }
O. A. Godin. Estimates for phase and group velocities of acoustic normal waves. Doklady Akademii Nauk, Tome 310 (1990) no. 5, pp. 1084-1089. http://geodesic.mathdoc.fr/item/DAN_1990_310_5_a13/