TY - JOUR AU - Verstraete, Jörg TI - Fuzzy regions: interpretations of surface area and distance JO - Control and Cybernetics PY - 2009 SP - 509 EP - 526 VL - 38 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CC_2009_38_2_a9/ LA - en ID - CC_2009_38_2_a9 ER -