@article{DAN_1996_351_6_a6, author = {O. A. Godin}, title = {A conservation law for the quasi-energy of waves in an}, journal = {Doklady Akademii Nauk}, pages = {751--755}, publisher = {mathdoc}, volume = {351}, number = {6}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1996_351_6_a6/} }