@article {64,
	title = {A Learning Approach to Hierarchical Feature Selection and Aggregation},
	journal = {Pattern Recognition Letters},
	year = {2010},
	author = {P. Ruvolo and I. Fasel and J. Movellan}
}
@conference {73,
	title = {Learning to Make Facial Expressions},
	booktitle = {IEEE International Conference on Development and Learning},
	year = {2009},
	author = {T. Wu and N. Butko and P. Ruvulo and M. Bartlett and J. Movellan}
}
