@article{MZ_1996__223_3_174908,
     author = {Paul Schmutz},
     title = {Arithmetic {Fuchsian} groups and the number of systoles.},
     journal = {Mathematische Zeitschrift},
     pages = {13--26},
     publisher = {mathdoc},
     volume = {223},
     number = {3},
     year = {1996},
     zbl = {0867.30032},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174908/}
}