@article{MAN_1976__222_162860,
     author = {A.G. van Asch},
     title = {Modular {Forms} and {Root} {Systems.}},
     journal = {Mathematische Annalen},
     pages = {145--170},
     publisher = {mathdoc},
     volume = {222},
     year = {1976},
     zbl = {0329.10017},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__222_162860/}
}