@article{JRAM_1984__351_152644,
     author = {J\"urgen Bingener and Hubert Flenner},
     title = {Variation of the divisor class group.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {20--41},
     publisher = {mathdoc},
     volume = {351},
     year = {1984},
     zbl = {0542.14003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__351_152644/}
}