Fields, L., Reeve, K. F., Adams, B. J., Brown, J. L., & Verhave, T. (1997). Predicting the extension of equivalence classes from primary generalization gradients: The merger of equivalence classes and perceptual classes.

Fields, L., K F. Reeve, B J. Adams, J L. Brown, ja T. Verhave. Predicting the Extension of Equivalence Classes From Primary Generalization Gradients: The Merger of Equivalence Classes and Perceptual Classes. 1997.

Fields, L., et al. Predicting the Extension of Equivalence Classes From Primary Generalization Gradients: The Merger of Equivalence Classes and Perceptual Classes. 1997.