Some latent trait models for measuring change in qualitative observations. Fischer, G. H. DJ Weis (comp.), New horizons in testing, Nueva York, Academic Press, 1983.
bibtex   
@article{fischer_latent_1983,
	title = {Some latent trait models for measuring change in qualitative observations},
	journal = {DJ Weis (comp.), New horizons in testing, Nueva York, Academic Press},
	author = {Fischer, G. H.},
	year = {1983}
}

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