@article{IM2_1991_37_1_a5,
     author = {P. I. Naumkin and I. A. Shishmarev},
     title = {On a system of equations describing surface waves},
     journal = {Izvestiya. Mathematics},
     pages = {119--156},
     year = {1991},
     volume = {37},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_37_1_a5/}
}