1. Aggarwal, C.C.: Clustering: Algorithms and Applications. CRC Press Taylor and Francis Group, Boca Raton (2014)
2. Amari, S.I.: Information geometry of the EM and em algorithms for neural networks. Neural Netw. 8(9), 1379–1408 (1995)
3. Balakrishnan, N., Nevzorov, V.B.: A Primer on Statistical Distributions. Wiley, Hoboken (2004)
4. Chen, J.C.: The nonnegative rank factorizations of nonnegative matrices. Linear Algebra Appl. 62, 207–217 (1984)
5. Dempster, A., Laird, N., Rubin, D.: Maximum likelihood from incomplete data via the EM algorithm. J. Royal Stat. Soc. 39(1), 1–38 (1977)