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Bock, R.D.; Aitkin, M. (1981). "Marginal maximum likelihood estimation of item parameters: application of an EM algorithm". Psychometrika. 46 (4): 443–459. doi:10.1007/BF02293801. S2CID122123206.
Camilli, Gregory (1994). "Origin of the Scaling Constant d = 1.7 in Item Response Theory". Journal of Educational and Behavioral Statistics. 19 (3): 293–295. doi:10.3102/10769986019003293. S2CID122401679.
Uebersax, J.S. (December 1999). "Probit latent class analysis with dichotomous or ordered category measures: conditional independence/dependence models". Applied Psychological Measurement. 23 (4): 283–297. doi:10.1177/01466219922031400. S2CID120497324.