Melvin Fitting. Pseudo-Boolean valued prolog. Studia Logica, 47(2):85-91, 1988. [doi]
@article{Fitting88-0, title = {Pseudo-Boolean valued prolog}, author = {Melvin Fitting}, year = {1988}, doi = {10.1007/BF00370283}, url = {http://dx.doi.org/10.1007/BF00370283}, researchr = {https://researchr.org/publication/Fitting88-0}, cites = {0}, citedby = {0}, journal = {Studia Logica}, volume = {47}, number = {2}, pages = {85-91}, }