Holte, Robert C., Yusra Alkhazraji, and Martin Wehrle. “A Generalization of Sleep Sets Based on Operator Sequence Redundancy”. Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 1 (March 4, 2015). Accessed August 16, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/9641.