%0 Journal Article %A J. Kloch %T The sufficient condition for linear constant time-lag systems to be normal systems %J Annales Polonici Mathematici %D 1976 %P 187-205 %V 32 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-32-2-187-205/ %R 10.4064/ap-32-2-187-205 %G en %F 10_4064_ap_32_2_187_205