@article{CMH_1949__22_138964,
     author = {Hans Petersson},
     title = {\"Uber die {Berechnung} der {Skalarprodukte} ganzer {Modulformen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {168--199},
     publisher = {mathdoc},
     volume = {22},
     year = {1949},
     zbl = {0032.20601},
     url = {http://geodesic.mathdoc.fr/item/CMH_1949__22_138964/}
}