@inbook {1731, title = {Test overlap rate and item exposure rate as indicators of test security in CATs}, year = {2009}, note = {PDF File, 261 K}, address = {D. J. Weiss (Ed.), Proceedings of the 2009 GMAC Conference on Computerized Adaptive Testing.}, author = {Barrada, J and Olea, J. and Ponsoda, V. and Abad, F. J.} }