TY - JOUR AU - Stanisław Gołąb AU - A. Pliś TI - On the notion of gradient. III. Gradient as a limit value of a surface integral JO - Annales Polonici Mathematici PY - 1960 SP - 13 EP - 22 VL - 8 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-13-22/ DO - 10.4064/ap-8-1-13-22 LA - en ID - 10_4064_ap_8_1_13_22 ER -