@article{VMUMM_1992_6_a2,
     author = {R. V. Guseinov},
     title = {Smoothness of solutions of a class of quasi-elliptic equations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {10--14},
     year = {1992},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1992_6_a2/}
}