%0 Journal Article %A Tohru Ogawa %A Yukihisa Nakajima %T Frustration, Degeneracy and Forms %J Visual Mathematics %D 2000 %V 2 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VM_2000_2_1_a1/ %G en %F VM_2000_2_1_a1