%0 Journal Article %A A. Fitzke %T Method of difference inequalities for parabolic equations with mixed derivatives %J Annales Polonici Mathematici %D 1975 %P 121-129 %V 31 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-31-2-121-129/ %R 10.4064/ap-31-2-121-129 %G en %F 10_4064_ap_31_2_121_129