@article{DAN_1983_273_5_a19,
     author = {S. M. Ponomarev},
     title = {An ill-posed problem in the theory of finite-amplitude waves in},
     journal = {Doklady Akademii Nauk},
     pages = {1105--1108},
     publisher = {mathdoc},
     volume = {273},
     number = {5},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_5_a19/}
}