%0 Journal Article %J International Journal of Testing %D 2008 %T Implementing Sympson-Hetter Item-Exposure Control in a Shadow-Test Approach to Constrained Adaptive Testing %A Veldkamp, Bernard P. %A van der Linden, Wim J. %B International Journal of Testing %V 8 %P 272-289 %U http://www.tandfonline.com/doi/abs/10.1080/15305050802262233 %R 10.1080/15305050802262233