Tao, Chongyang, Lili Mou, Dongyan Zhao, and Rui Yan. 2018. “RUBER: An Unsupervised Method for Automatic Evaluation of Open-Domain Dialog Systems”. Proceedings of the AAAI Conference on Artificial Intelligence 32 (1). https://doi.org/10.1609/aaai.v32i1.11321.