@article {194, title = {Theoretical results and item selection from multidimensional item bank in the Mokken IRT model for polytomous items}, journal = {Applied Psychological Measurement}, volume = {19}, number = {4}, year = {1995}, pages = {337{\textendash}352}, author = {Hemker, B. T. and Sijtsma, K. and Molenaar, I. W.} }