@article{VMUMM_1991_6_a13,
     author = {N. R. Sibgatullin},
     title = {On the theory of narrow-band wave packets on a free surface},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {70--75},
     year = {1991},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_6_a13/}
}