@Article{zbMATH03306133,
Author = {M. I. {Freidlin}},
Title = {{On the smoothness of solutions of degenerate elliptic equations}},
FJournal = {{Mathematics of the USSR. Izvestiya}},
Journal = {{Math. USSR, Izv.}},
ISSN = {0025-5726},
Volume = {2},
Pages = {1337--1359},
Year = {1970},
Publisher = {American Mathematical Society (AMS), Providence, RI},
Language = {English},
Zbl = {0192.45102}
}