@article{DAN_1972_205_5_a11,
     author = {P. S. Filatov},
     title = {On differentiability properties of solutions to equations of quasi- elliptic type in unbounded domains},
     journal = {Doklady Akademii Nauk},
     pages = {1050--1053},
     publisher = {mathdoc},
     volume = {205},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_205_5_a11/}
}