Wang, Dingmin, Yeyuan Chen, and Bernardo Cuenca Grau. “Efficient Embeddings of Logical Variables for Query Answering over Incomplete Knowledge Graphs”. Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 4 (June 26, 2023): 4652-4659. Accessed September 19, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/25588.