@article{MZ_1974__139_172117,
     author = {Friederich Ischebeck},
     title = {Zur {Picard-Gruppe} eines {Produktes.}},
     journal = {Mathematische Zeitschrift},
     pages = {141--158},
     publisher = {mathdoc},
     volume = {139},
     year = {1974},
     zbl = {0275.14004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__139_172117/}
}