@conference {47,
	title = {On Quaternion-Based Attitude Control and the Unwinding Phenomenon},
	booktitle = {Proc. 30th American Control Conference},
	series = {NULL},
	year = {2011},
	pages = {299{\textendash}304},
	keywords = {attitude control},
	doi = {http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5991127},
	author = {C. G. Mayhew and R. G. Sanfelice and A. R. Teel}
}
