@inproceedings{f.1890mesure,
title={Mesure de la courbure des surfaces suivant l'idée commune.},
author={F. Casorati},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202950901131935},
booktitle={Acta Mathematica},
volume={14},
number={1},
pages={95-110},
year={1890},
}