@inbook {1973,
	title = {Adaptive Branching in a Multi-Content Achievement Test},
	year = {1977},
	address = {D. J. Weiss (Ed.), Proceedings of the 1977 Computerized Adaptive Testing Conference. Minneapolis MN: University of Minnesota, Department of Psychology, Psychometric Methods Program},
	author = {Pennell, R. J. and Harris, D. A.}
}
@booklet {1397,
	title = {Flexilevel adaptive testing paradigm: Validation in technical training},
	year = {1977},
	address = {AFHRL Technical Report 77-35 (I)},
	author = {Hansen, D. N. and Ross, S. and Harris, D. A.}
}
@booklet {1398,
	title = {Flexilevel adaptive training paradigm: Hierarchical concept structures},
	year = {1977},
	address = {AFHRL Technical Report 77-35 (II)},
	author = {Hansen, D. N. and Ross, S. and Harris, D. A.}
}
