@article{ZNSL_1979_84_a15,
     author = {P. I. Plotnikov},
     title = {Existence of space waves on the surface of ideal fluid},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {211--219},
     publisher = {mathdoc},
     volume = {84},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_84_a15/}
}