Chen, S., Y. Wang, J. Liu, and Y. Wang. “Bidirectional Machine Reading Comprehension for Aspect Sentiment Triplet Extraction”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 14, May 2021, pp. 12666-74, https://ojs.aaai.org/index.php/AAAI/article/view/17500.