%0 Journal Article %A J. Tervo %T On algebraic characterization of coercive linear partial differential operators with constant coefficients %J Annales Polonici Mathematici %D 1988 %P 209-219 %V 49 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-49-3-209-219/ %R 10.4064/ap-49-3-209-219 %G en %F 10_4064_ap_49_3_209_219