%0 Journal Article %A J. Chabrowski %T On the representation of non-negative solutions of linear parabolic systems of partial differential equations %J Annales Polonici Mathematici %D 1973 %P 11-16 %V 28 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-28-1-11-16/ %R 10.4064/ap-28-1-11-16 %G en %F 10_4064_ap_28_1_11_16