Zhang, W., Y. Ying, P. Lu, and H. Zha. “Learning Long- and Short-Term User Literal-Preference With Multimodal Hierarchical Transformer Network for Personalized Image Caption”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 05, Apr. 2020, pp. 9571-8, doi:10.1609/aaai.v34i05.6503.