%0 Journal Article %A A. S. Kalashnikov %T Some problems for linear partial differential equations with constant coefficients in the entire space and for a~class of degenerate equations in a~halfspace %J Sbornik. Mathematics %D 1971 %P 186-198 %V 14 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1971_14_2_a1/ %G en %F SM_1971_14_2_a1