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@article{TM_1985_172_a16, author = {P. I. Lizorkin}, title = {On the theory of degenerate elliptic equations}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {235--251}, publisher = {mathdoc}, volume = {172}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1985_172_a16/} }
P. I. Lizorkin. On the theory of degenerate elliptic equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations on the theory of functions of several real variables and approximation of functons, Tome 172 (1985), pp. 235-251. http://geodesic.mathdoc.fr/item/TM_1985_172_a16/