Elliptic and Parabolic Equations with Discontinuous CoefficientsAntonino Maugeri, Dian K. Palagachev, Lubomira G. Softova · First published 2003Open the Tome
Degenerate Oblique Derivative Problem for Elliptic and Parabolic EquationsPeter R. Popivanov, Dian K. Palagachev · First published 1998Open the Tome