@article{JDM_1907__16_145075,
     author = {J. Neuberg},
     title = {\"Uber die {Ber\"uhrungskugeln} eines {Tetraeders.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {345--358},
     publisher = {mathdoc},
     volume = {16},
     year = {1907},
     zbl = {38.0545.03},
     url = {http://geodesic.mathdoc.fr/item/JDM_1907__16_145075/}
}