%0 Journal Article %A Harald A. Helfgott %A Ira M. Gessel %T Tilings of Diamonds and Hexagons with Defects %J The electronic journal of combinatorics %D 1999 %V 6 %U http://geodesic.mathdoc.fr/articles/10.37236/1448/ %R 10.37236/1448 %F 10_37236_1448