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@article{MZM_1988_44_1_a13, author = {N. G. Khor'kova}, title = {Conservation laws and nonlocal symmetries}, journal = {Matemati\v{c}eskie zametki}, pages = {134--144}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1988_44_1_a13/} }
N. G. Khor'kova. Conservation laws and nonlocal symmetries. Matematičeskie zametki, Tome 44 (1988) no. 1, pp. 134-144. http://geodesic.mathdoc.fr/item/MZM_1988_44_1_a13/