Tena Cucala, David J, Przemysław A Wałęga, Bernardo Cuenca Grau, and Egor Kostylev. “Stratified Negation in Datalog With Metric Temporal Operators”. Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 7 (May 18, 2021): 6488-6495. Accessed April 23, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/16804.