TY - JOUR AU - K. Kh. Boimatov TI - Coercive estimates and separability for second-order nonlinear differential operators JO - Matematičeskie zametki PY - 1989 SP - 110 EP - 112 VL - 46 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1989_46_6_a15/ LA - ru ID - MZM_1989_46_6_a15 ER -