Key points are not available for this paper at this time.
Mixture Models: Inference and Applications to Clustering (Statistics: Textbooks and Monographs Series, Vol. 84). By G. J. McLachlan and K. E. Basford. Dekker, New York, 1988. xii + 254 pp. 83. 50.
Geary et al. (Sun,) studied this question.