@article{JRAM_1908__134_149284,
     author = {Ph. Furtw\"angler},
     title = {\"Uber die {Klassenzahlen} {Abelscher} {Zahlk\"orper.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {91--94},
     publisher = {mathdoc},
     volume = {134},
     year = {1908},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1908__134_149284/}
}