TY - JOUR AU - G. G. Ivanov TI - Symmetries, conservation laws, and exact solutions in nonlinear sigma models JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1983 SP - 45 EP - 54 VL - 57 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1983_57_1_a5/ LA - ru ID - TMF_1983_57_1_a5 ER -