%0 Journal Article %A Gregg Musiker %A James Propp %T Combinatorial interpretations for rank-two cluster algebras of affine type. %J The electronic journal of combinatorics %D 2007 %V 14 %U http://geodesic.mathdoc.fr/articles/10.37236/933/ %R 10.37236/933 %F 10_37236_933