@article{MAN_1989__285_1_164614,
     author = {A.J. Scholl},
     title = {On modular units.},
     journal = {Mathematische Annalen},
     pages = {503--510},
     publisher = {mathdoc},
     volume = {285},
     number = {1},
     year = {1989},
     zbl = {0663.10025},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164614/}
}