Dai, Y., J. Liu, X. Ren, and Z. Xu. “Adversarial Training Based Multi-Source Unsupervised Domain Adaptation for Sentiment Analysis”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 05, Apr. 2020, pp. 7618-25, doi:10.1609/aaai.v34i05.6262.