The difficulty of test items that measure more than one ability. Reckase, M. D. Applied Psychological Measurement, 9:401, 1985.
bibtex   
@article{reckase_difficulty_1985,
	title = {The difficulty of test items that measure more than one ability},
	volume = {9},
	journal = {Applied Psychological Measurement},
	author = {Reckase, M. D.},
	year = {1985},
	pages = {401}
}
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