@article{MAN_1887__30_157300,
     author = {R. von Lilienthal},
     title = {Zur {Theorie} der {Kr\"ummungsmittelpunktfl\"achen}},
     journal = {Mathematische Annalen},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {30},
     year = {1887},
     url = {http://geodesic.mathdoc.fr/item/MAN_1887__30_157300/}
}