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Pothos, E. M., Perlman, A., Bailey, T. M. , Kurtz, K., Edwards, D. J., Hines, P. & McDonnell, J. V. (2011). Measuring category intuitiveness in unconstrained categorization tasks. Cognition, 121(1), pp. 83-100. doi: 10.1016/j.cognition.2011.06.002