@article{10_2307_121033,
     author = {William A. Veech},
     title = {Siegel measures},
     journal = {Annals of mathematics},
     year = {1998},
     volume = {148},
     number = {3},
     doi = {10.2307/121033},
     zbl = {0922.22003},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121033/}
}