%0 Journal Article %A Doron Zeilberger %T The umbral transfer-matrix method. IV: Counting self-avoiding polygons and walks %J The electronic journal of combinatorics %D 2001 %V 8 %N 1 %U http://geodesic.mathdoc.fr/articles/10.37236/1572/ %R 10.37236/1572 %F 10_37236_1572