Huang, Q., Z. Gan, A. Celikyilmaz, D. Wu, J. Wang, and X. He. “Hierarchically Structured Reinforcement Learning for Topically Coherent Visual Story Generation”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 33, no. 01, July 2019, pp. 8465-72, doi:10.1609/aaai.v33i01.33018465.