TY - JOUR AU - Lowen-Colebunders, E. AU - Szabo, Z. G. TI - Simplicity of Categories Defined by Symmetry Axioms JO - Canadian mathematical bulletin PY - 1991 SP - 240 EP - 248 VL - 34 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-039-0/ DO - 10.4153/CMB-1991-039-0 ID - 10_4153_CMB_1991_039_0 ER -