@article{TMF_1983_57_1_a5,
     author = {G. G. Ivanov},
     title = {Symmetries, conservation laws, and exact solutions in nonlinear sigma models},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {45--54},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_57_1_a5/}
}