Non-negative Matrix Factorization with Sparseness Constraints.

Patrik O. Hoyer Non-negative Matrix Factorization with Sparseness Constraints. 1457-1469 2004 5 Journal of Machine Learning Research http://www.jmlr.org/papers/volume5/hoyer04a/hoyer04a.pdf db/journals/jmlr/jmlr5.html#Hoyer04