Li, Z., Y. Wei, Y. Zhang, X. Zhang, and X. Li. “Exploiting Coarse-to-Fine Task Transfer for Aspect-Level Sentiment Classification”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 33, no. 01, July 2019, pp. 4253-60, doi:10.1609/aaai.v33i01.33014253.