Dempster AP, Laird NM, Rubin DB. (1977). Maximum likelihood from incomplete data via the EM algorithm. J R Stat Soc B. 39
Lecun Y et al. (1989). Backpropagation applied to handwritten zip code recognition Neural Comput. 1
Lee DD, Seung HS. (1999). Learning the parts of objects by non-negative matrix factorization. Nature. 401 [PubMed]
Oja E. (1989). Neural networks, principal components, and subspaces Int J Neural System. 1
Seung HS, Lee DD. (2000). Algorithms for non-negative matrix factorization Advances in neural information processing systems. 13
Spratling MW, Johnson MH. (2002). Preintegration lateral inhibition enhances unsupervised learning. Neural computation. 14 [PubMed]