@article{MZ_1964__84_170276,
     author = {Elmar Thoma},
     title = {\"Uber positiv-definite {Klassenfunktionen} abz\"ahlbarer {Gruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {389--402},
     publisher = {mathdoc},
     volume = {84},
     year = {1964},
     zbl = {0136.11701},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__84_170276/}
}