@inbook {1893,
	title = {Item selection with biased-coin up-and-down designs},
	year = {2009},
	note = {{PDF file, 748 KB}},
	address = {D. J. Weiss (Ed.), Proceedings of the 2009 GMAC Conference on Computerized Adaptive Testing.},
	author = {Sheng, Y. and Sheng, Z.}
}
