@article{JRAM_1860__57_147786,
     author = {Gustav Lejeune Dirichlet},
     title = {Ueber den biquadratischen {Character} der {Zahl} },
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {187--188},
     publisher = {mathdoc},
     volume = {57},
     year = {1860},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1860__57_147786/}
}