@article{FAA_1977_11_3_a4,
     author = {B. A. Kupershmidt and Yu. I. Manin},
     title = {Long-wave equation with free boundaries. {I.} {Conservation} laws and solution},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {31--42},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1977_11_3_a4/}
}