Nieberding, R. J., Gacono, C. B., Pirie, M., Bannatyne, L. A., Viglione, D. J., Cooper, B., Bodholdt, R. H., & Frackowiak, M. (2003). MMPI-2 based classification of forensic psychiatric outpatients: An exploratory cluster analytic study. Journal of Clinical Psychology, 59(9), 907–920. http://www.interscience.wiley.com/jpages/0021-9762/