A nonlinear mixed model framework for item response theory. Rijmen, F., Tuerlinckx, F., De Boeck, P., & Kuppens, P. Psychological methods, 8:185–205, 2003.
doi  bibtex   
@article{rijmen_nonlinear_2003,
	title = {A nonlinear mixed model framework for item response theory.},
	volume = {8},
	doi = {10.1037/1082-989X.8.2.185},
	journal = {Psychological methods},
	author = {Rijmen, F. and Tuerlinckx, F. and De Boeck, P. and Kuppens, P.},
	year = {2003},
	pages = {185--205}
}
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