@article{TRSPY_1985_172_a16,
     author = {P. I. Lizorkin},
     title = {On the theory of degenerate elliptic equations},
     journal = {Informatics and Automation},
     pages = {235--251},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a16/}
}