Peng, H., L. Xu, L. Bing, F. Huang, W. Lu, and L. Si. “Knowing What, How and Why: A Near Complete Solution for Aspect-Based Sentiment Analysis”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 05, Apr. 2020, pp. 8600-7, doi:10.1609/aaai.v34i05.6383.