Z. Yu, Y. Liu, B. Li, S. Pang, C. Jia, "Incremental graph regulated nonnegative matrix factorization for face recognition", Journal of Applied Mathematics, 2014.
W. Chen, Y. Zhao, B. Pan, "Supervised kernel nonnegative matrix factorization for face recognition", Neurocomputing, Volume 205, pages 165-181, 2016.