@inbook {1922,
	title = {Constrained adaptive testing with shadow tests},
	year = {2000},
	address = {W. J. van der Linden and C. A. W. Glas (eds.), Computerized adaptive testing: Theory and practice (pp.27-52). Norwell MA: Kluwer.},
	author = {van der Linden, W. J.}
}
