@inproceedings{herbert1936krümmungseigenschaften,
title={Krümmungseigenschaften Konvexer Flächen},
author={Herbert Busemann, and Willy Feller},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203107622690551},
booktitle={Acta Mathematica},
volume={66},
number={1},
pages={1-47},
year={1936},
}
Herbert Busemann, and Willy Feller. Krümmungseigenschaften Konvexer Flächen. 1936. Vol. 66. In Acta Mathematica. pp.1-47. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203107622690551.