@article{AIHPA_1979__31_1_25_0,
     author = {Matveev, V. B. and Yavor, M. I.},
     title = {Solutions presque p\'eriodiques et a {N-solitons} de l'\'equation hydrodynamique non lin\'eaire de {Kaup}},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {25--41},
     publisher = {Gauthier-Villars},
     volume = {31},
     number = {1},
     year = {1979},
     mrnumber = {557050},
     zbl = {0435.76016},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1979__31_1_25_0/}
}