1. Barnes-Holmes, Y., Barnes-Holmes, D., & Smeets, P. M. (2004a). Establishing relational responding in accordance with opposite as generalized operant behavior in young children. International Journal of Psychology and Psychological Therapy, 4, 559–586.
2. Barnes-Holmes, Y., Barnes-Holmes, D., Smeets, P. M., Strand, P., & Friman, P. (2004b). Establishing relational responding in accordance with more-than and less-than as generalized operant behavior in young children. International Journal of Psychology and Psychological Therapy, 4, 161–189.
3. Berens, N. M., & Hayes, S. C. (2007). Arbitrarily applicable comparative relations: Experimental evidence for a relational operant. Journal of Applied Behavior Analysis, 40(1), 45–71. https://doi.org/10.1901/jaba.2007.7-06
4. Cassidy, S., Roche, B., & Hayes, S. C. (2011). A relational frame training intervention to raise intelligence quotients: A pilot study. The Psychological Record, 61, 173–198.
5. Dougher, M. J., Auguston, E., Markham, M. R., Greenway, D. E., & Wulfert, E. (1994). The transfer of respondent eliciting and extinction functions through stimulus equivalence classes. The Experimental Analysis of Behavior, 62(3), 331–351.