@article{JDM_1919__28_145557,
     author = {R. v. Lilienthal},
     title = {Zur {Theorie} der geod\"atischen {Linien.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {1--19},
     publisher = {mathdoc},
     volume = {28},
     year = {1919},
     zbl = {47.0659.02},
     url = {http://geodesic.mathdoc.fr/item/JDM_1919__28_145557/}
}