@article{MAN_1992__292_2_164917,
     author = {L. Gerritzen and B. Brinkmann},
     title = {The lowest term of the {Schottky} modular form.},
     journal = {Mathematische Annalen},
     pages = {329--336},
     publisher = {mathdoc},
     volume = {292},
     number = {2},
     year = {1992},
     zbl = {0747.11022},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164917/}
}