Harold Boley. RELFUN: A relational/functional integration with valued clauses. SIGPLAN Notices, 21(12):87-98, 1986. [doi]
@article{Boley86-0, title = {RELFUN: A relational/functional integration with valued clauses}, author = {Harold Boley}, year = {1986}, doi = {10.1145/15042.15045}, url = {https://doi.org/10.1145/15042.15045}, researchr = {https://researchr.org/publication/Boley86-0}, cites = {0}, citedby = {0}, journal = {SIGPLAN Notices}, volume = {21}, number = {12}, pages = {87-98}, }