TY - JOUR AU - Crombez G. TI - Group theoretical methods in Gray-scale mathematical morphology JO - Novi Sad Journal of Mathematics PY - 1990 SP - 31 EP - 41 VL - 20 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NSJOM_1990_20_2a_3/ ID - NSJOM_1990_20_2a_3 ER -