TY - JOUR AU - V. E. Fedorov TI - A class of second order Sobolev type equations and degenerate groups of operators JO - Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika PY - 2011 SP - 59 EP - 75 IS - 13 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VCHGU_2011_13_a5/ LA - ru ID - VCHGU_2011_13_a5 ER -