@booklet {1606, title = {Unidimensional approximations for a computerized adaptive test when the item pool and latent space are multidimensional (Research Report 97-5)}, year = {1997}, address = {Iowa City IA: ACT Inc}, author = {Spray, J. A. and Abdel-Fattah, A. A. and Huang, C.-Y. and Lau, CA} }