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Hoyer PO (2002) Non-negative sparse coding Proceedings of IEEE Workshop on Neural Networks for Signal Processing :557-565

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Hasler S, Wersing H, K├Ârner E (2007) Combining reconstruction and discrimination with class-specific sparse coding. Neural Comput 19:1897-918 [Journal] [PubMed]

Lin CJ (2007) Projected gradient methods for nonnegative matrix factorization. Neural Comput 19:2756-79 [Journal] [PubMed]

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