Crawford S.L., DeGroot M.H., Kadane J.B., and Small M.J. (1992), Modeling lake-chemistry
distributions: Approximate Bayesian methods for estimating a finite-mixture model, *Technometrics*,
34, pp 441-450.

Crawford S.L. (1994) An application of the Laplace method to finite mixture distributions, *JASA*, 89. pp 269-278.

McLachlan G. and Peel D., *Finite Mixture Models*, Wiley, New York.