1) SASAKI Y. Approximation method for probability distribution functions using Cox distribution to evaluate multimedia systems. Proc. 2001 Pacific Rim International Symp. on Dependable Computing. (2001)
2) SASAKI Y. Approximation method for probability distribution functions by Coxian distribution. AIWARM 2004. (2004)
3) THUMMLER A. A Novel Approach for Fitting Probability Distributions to Real Trace Data with the EM Algorithm. Proc. 2005 Int. Conf. on Dependable Systems and Networks. IEEE Computer Society Press. (2005)
4) ASUMUSSEN S. Fitting phase-type distributions via the EM algorithm. Scandinavian J. Statist.. (1996) vol.23, p.419-441.