G., O(1) loop model with different boundary conditions and symmetry classes of alternating-sign matrices], Theor. Math. Phys., 142 (2005), 237–243, Robbins, David P., The story of , The Mathematical Intelligencer, 13 (2), 12–19 (1991), . Zeilberger, Doron, Proof of the refined alternating sign matrix conjecture, New York Journal of Mathematics 2 (1996), 59–68. External links Alternating sign matrix entry in MathWorld Alternating sign matrices entry in the FindStat database Matrices Enumerative combinatorics