%0 Journal Article %A Lowen-Colebunders, E. %A Szabo, Z. G. %T Simplicity of Categories Defined by Symmetry Axioms %J Canadian mathematical bulletin %D 1991 %P 240-248 %V 34 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-039-0/ %R 10.4153/CMB-1991-039-0 %F 10_4153_CMB_1991_039_0