%0 Journal Article %A Stanisław Gołąb %A A. Pliś %T On the notion of gradient. III. Gradient as a limit value of a surface integral %J Annales Polonici Mathematici %D 1960 %P 13-22 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-13-22/ %R 10.4064/ap-8-1-13-22 %G en %F 10_4064_ap_8_1_13_22