@PhDThesis{ fb:98b,
author = {F. Bullo},
title = {Nonlinear Control of Mechanical Systems: A {R}iemannian Geometry Approach},
school = {Control and Dynamical Systems Department, California Institute of Technology},
address = {Pasadena, CA},
year = 1998,
month = aug,
pdf = {http://motion.mee.ucsb.edu/pdf/phd-fb-7aug98.pdf} 
}

@InProceedings{ fb:97a,
author = "F. Bullo",
title = "Exponential stabilization of relative equilibria for mechanical systems with symmetries",
booktitle = mtns,
month = jul,
year = 1998,
address = "Padova, Italy",
pages = {987--990},
pdf = {http://motion.mee.ucsb.edu/pdf/1997a-b.pdf} 
}

@InProceedings{ fb-nel:97a,
author = "F. Bullo and N. E. Leonard",
title = "Motion primitives for stabilization and control of underactuated vehicles",
booktitle = nolcos,
month = jul,
year = 1998,
address = "Enschede, the Netherlands",
pages = {133--138},
volume = 1,
pdf = {http://motion.mee.ucsb.edu/pdf/1997a-bl.pdf} 
}

@InProceedings{ fb-mz:98a,
author = "F. Bullo and M. {\v Z}efran",
title = "On modeling and locomotion of hybrid mechanical systems with impacts",
pages = {2633--2638},
booktitle = cdc,
year = 1998,
address = "Tampa, FL",
month = dec,
pdf = {http://motion.mee.ucsb.edu/pdf/1998a-bz.pdf} 
}