1. Creating a test information profile for a two-dimensional latent space;Ackerman;Appl. Psychol. Meas.,1994
2. Graphical representation of multidimensional item response theory analyses;Ackerman;Appl. Psychol. Meas.,1996
3. Comparison of Three Unidimensional Approaches to Represent a Two-Dimensional Latent Ability Space;Ackerman,2019
4. RWinsteps: Running Winsteps in R;Albano,2019
5. Introduction to Measurement Theory;Allen,1979