@article{CMH_1966__41_139326,
     author = {M. Gut and M. St\"unzi},
     title = {Kongruenzen zwischen {Koeffizienten} trigonometrischer {Reihen} und {Klassenzahlen} quadratisch imagin\"arer {K\"orper.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {287--302},
     publisher = {mathdoc},
     volume = {41},
     year = {1966},
     zbl = {0149.29001},
     url = {http://geodesic.mathdoc.fr/item/CMH_1966__41_139326/}
}