Claudio Bernardi, Andrea Sorbi. Classifying Positive Equivalence Relations. Journal of Symbolic Logic, 48(3):529-538, 1983.
@article{BernardiS83, title = {Classifying Positive Equivalence Relations}, author = {Claudio Bernardi and Andrea Sorbi}, year = {1983}, researchr = {https://researchr.org/publication/BernardiS83}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {48}, number = {3}, pages = {529-538}, }