Bernhard Convent. On the Safety of Horn Clause Queries without Functions Symbols. In Relational Databases and their Extensions. pages 37-54, 1988.
@inproceedings{Convent88, title = {On the Safety of Horn Clause Queries without Functions Symbols}, author = {Bernhard Convent}, year = {1988}, researchr = {https://researchr.org/publication/Convent88}, cites = {0}, citedby = {0}, pages = {37-54}, booktitle = {Relational Databases and their Extensions}, }