@Article{Busso_2007,
	author =	 {C. Busso and Z. Deng and M. Grimm and U. Neumann and S. Narayanan},
	title =	 {Rigid Head Motion in Expressive Speech Animation: Analysis and Synthesis},
	journal =	 {IEEE Transactions on Audio, Speech and Language Processing},
	year =	 {2007},
	volume =	 {15},
	number =	 {3},
	pages =	 {1075-1086},
	month =	 {March},
	doi={10.1109/TASL.2006.885910},
}