@article {210,
	title = {Robust global exponential stabilization on the n-dimensional sphere with applications to trajectory tracking for quadrotors},
	journal = {Automatica},
	volume = {110},
	year = {2019},
	month = {December},
	author = {P. Casau and C. G. Mayhew and R. G. Sanfelice and C. Silvestre}
}
