@inproceedings{ICPR-2012-TuH,
	author        = "Yi-Han Tu and Chiou-Ting Hsu",
	booktitle     = "{Proceedings of the 21st International Conference on Pattern Recognition}",
	isbn          = "978-1-4673-2216-4",
	pages         = "2391--2394",
	publisher     = "{IEEE Computer Society}",
	title         = "{Dual subspace nonnegative matrix factorization for person-invariant facial expression recognition}",
	year          = 2012,
}