Altering the level of difficulty in computer adaptive testing. Bergstrom, B. A., Lunz, M. E., & Gershon, R. C. Applied Measurement in Education, 5:137–149, 1992.
bibtex   
@article{bergstrom_altering_1992,
	title = {Altering the level of difficulty in computer adaptive testing},
	volume = {5},
	journal = {Applied Measurement in Education},
	author = {Bergstrom, B. A. and Lunz, M. E. and Gershon, R. C.},
	year = {1992},
	pages = {137--149}
}
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