%0 Journal Article %A W.A. Veech %T Teichmüller curves in moduli space, Eisenstein series and an application to triangular billiards. %J Inventiones mathematicae %D 1989 %P 553-584 %V 97 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1989__97_2_143714/ %F IM_1989__97_2_143714