@article{JDM_1969__71_146571,
     author = {Herbert Busemann},
     title = {Synthetische {Differentialgeometrie.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {1--24},
     year = {1969},
     volume = {71},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JDM_1969__71_146571/}
}