@article{FAA_1977_11_1_a10,
     author = {A. V. Zhiber},
     title = {Conservation laws for the equation $u_{tt}-u_{xx}+\sin u=0$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {65--66},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1977_11_1_a10/}
}