1. STEPIT, computer program in Fortran, version 5.2;Chandler,1967
2. Mechanisms of cognitive judgment;Höijer,1969
3. Induced variants on quadratic similarity judgments;Gregson,1969
4. Quadratic similarities;Gregson;British Journal of Mathematical Statistical Psychology,1970
5. Some properties of quadratic similarity judgments between 4-dimensional stimuli;Gregson;British Journal of Mathematical Statistical Psychology,1972