Sohre, Nicholas, Moses Adeagbo, Nathaniel Helwig, Sofia Lyford-Pike, and Stephen Guy. 2018. “PVL: A Framework for Navigating the Precision-Variety Trade-Off in Automated Animation of Smiles”. Proceedings of the AAAI Conference on Artificial Intelligence 32 (1). https://doi.org/10.1609/aaai.v32i1.11431.