@book {1656,
	title = {Incomplete orders and computerized testing},
	year = {1976},
	note = {{PDF file, 373 KB}},
	address = {In C. K. Clark (Ed.), Proceedings of the First Conference on Computerized Adaptive Testing (pp. 18-23). Washington DC: U.S. Government Printing Office.},
	author = {Cliff, N. A.}
}
