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@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/} }
A. V. Zhiber. Conservation laws for the equation $u_{tt}-u_{xx}+\sin u=0$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 11 (1977) no. 1, pp. 65-66. http://geodesic.mathdoc.fr/item/FAA_1977_11_1_a10/
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