@conference {55,
	title = {Passivity-based Controllers for a Class of Hybrid Systems with Applications to Mechanical Systems Interacting with their Environment},
	booktitle = {Proc. Joint Conference on Decision and Control and European Control Conference},
	series = {NULL},
	year = {2011},
	pages = {7416{\textendash}7421},
	keywords = {hybrid systems},
	doi = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6161066\&tag=1},
	url = {https://hybrid.soe.ucsc.edu/files/preprints/55.pdf},
	author = {R. Naldi and R. G. Sanfelice}
}
