@article {susko1998constrained,
	title = {Constrained nonparametric maximum-likelihood estimation for mixture models},
	journal = {Canadian Journal of Statistics},
	volume = {26},
	number = {4},
	year = {1998},
	pages = {601{\textendash}617},
	publisher = {Wiley Online Library},
	author = {Susko, E and Kalbfleisch, JD and Chen, J}
}
