Peter B. Ladkin, Roger D. Maddux. On Binary Constraint Problems. Journal of the ACM, 41(3):435-469, 1994. [doi]
@article{LadkinM94, title = {On Binary Constraint Problems}, author = {Peter B. Ladkin and Roger D. Maddux}, year = {1994}, doi = {10.1145/176584.176585}, url = {http://doi.acm.org/10.1145/176584.176585}, tags = {constraints}, researchr = {https://researchr.org/publication/LadkinM94}, cites = {0}, citedby = {0}, journal = {Journal of the ACM}, volume = {41}, number = {3}, pages = {435-469}, }