%0 Journal Article %A A. Pliƛ %T On the uniqueness of the non-negative solution of the homogeneous mixed problem for a system of partial differential equations %J Annales Polonici Mathematici %D 1959 %P 255-258 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-7-3-255-258/ %R 10.4064/ap-7-3-255-258 %G en %F 10_4064_ap_7_3_255_258