Artale, Alessandro, Roman Kontchakov, Vladislav Ryzhikov, and Michael Zakharyaschev. “Tractable Interval Temporal Propositional and Description Logics”. Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 1 (February 18, 2015). Accessed August 18, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/9406.