@INPROCEEDINGS{fon15,
title={A passive guidance system for a robotic walking assistant using brakes},
author={Fontanelli, D. and Giannitrapani L. and Palopoli, L. and Prattichizzo, D.},
booktitle={Decision and Control (cdc2015), 2015 Proc. of 54th IEEE Conference on},
year={2015},
month={Dec.},
address={Osaka, Japan}
}