@article{DAN_1986_288_4_a7,
     author = {L. A. Kalyakin},
     title = {Long-wave asymptotics of solutions of nonlinear systems of},
     journal = {Doklady Akademii Nauk},
     pages = {809--813},
     year = {1986},
     volume = {288},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_288_4_a7/}
}