@article{MM2_1981__36_154809,
     author = {Rudolf Haggenm\"uller},
     title = {Diskriminanten und {Picard-Invarianten} freier quadratischer {Erweiterungen.}},
     journal = {Manuscripta mathematica},
     pages = {83--104},
     publisher = {mathdoc},
     volume = {36},
     year = {1981},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MM2_1981__36_154809/}
}