SMOOTHNESS OF GENERALIZED SOLUTIONS OF ELLIPTIC DIFERENCE-DIFERENTIAL EQUATIONS WITH DEGENERATION NEAR BOUNDARIES OF SUBDOMAINS Article Popov V.A., Skubachevskii A.L. Russian Mathematical Surveys. Vol. 66. 2011. P. 1204-1206
A PRIORI ESTIMATES FOR ELLIPTIC DIFFERENTIAL-DIFFERENCE OPERATORS WITH DEGENERATION Article Popov V.A., Skubachevskii A.L. Journal of Mathematical Sciences (United States). Springer New York LLC. Vol. 171. 2010. P. 130-148
SECTORIAL DIFFERENTIAL-DIFFERENCE OPERATORS WITH DEGENERATION Article Popov V.A., Skubachevskii A.L. Doklady Mathematics. Vol. 80. 2009. P. 716-719