ECKES, C.; BIATOV, K.; HÜLSKEN, F.; KÖHLER, J.; BREUER, P.; BRANCO, P.; ENCARNACAO, . L. M. Towards Sociable Virtual Humans: Multimodal Recognition of Human Input and Behavior. International Journal of Virtual Reality, [S. l.], v. 6, n. 4, p. 21–30, 2007. DOI: 10.20870/IJVR.2007.6.4.2705. Disponível em: https://ijvr.eu/article/view/2705. Acesso em: 16 aug. 2022.