@article{VCHGU_2011_13_a5,
     author = {V. E. Fedorov},
     title = {A class of second order {Sobolev} type equations and degenerate groups of operators},
     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
     pages = {59--75},
     publisher = {mathdoc},
     number = {13},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VCHGU_2011_13_a5/}
}