4[1]A.P. Dempster, N. M. Laird and D. B. Rubin. Maximum Likelihood from Incomplete Data via the EM Algorithm[J]. J. R. Statist. Soc. B, 1977(39), 1-38,
5[2]Xu,L. and M. I. Jordan, On the Convergence Properties of the EM Algorithm for Gaussian Mixtues[J]. Neural Compution, 1996(8), 129-151.
6[3]Lei Xu. Comparatives Analysis on Convergence Rates of the EM Algorithms and its Two Modifications for Gaussian mixtures[J]. Neural Processing, 1997(6), 69-76.
7[4]S. R. Gerald. Matrix Derivatives[M], New York: Dekker. 1980.
8[5]Jinwen Ma, Lei Xu and Michael I. Jordan. Asymptotic Convergence Rate of the EM Algorithm for Gaussian Mixtures[J]. Neural Computation, 2000(12), 2881-2907.