Mixture of latent trait analyzers for model-based clustering of categorical data. Gollini, I. & Murphy, T. Statistics and Computing, 24(4):569–588, Springer, 2014.
bibtex   
@article{gollini2014mixture,
	Author = {Gollini, I. and Murphy, T.},
	Journal = {Statistics and Computing},
	Number = 4,
	Pages = {569--588},
	Publisher = {Springer},
	Title = {Mixture of latent trait analyzers for model-based clustering of categorical data},
	Volume = 24,
	Year = 2014}

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