@article{JRAM_1876__81_183403,
     author = {F. Caspary},
     title = {Die {Kr\"ummungsmittelpunktsfl\"achen} des elliptischen {Paraboloids.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {143--192},
     year = {1876},
     volume = {81},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1876__81_183403/}
}