HAGEN, L. Kirk. Unification-Based Parsing Applications for Intelligent Foreign Language Tutoring Systems. CALICO Journal, [S. l.], v. 12, n. 2-3, p. 5–31, 2013. DOI: 10.1558/cj.v12i2-3.5-31. Disponível em: https://journal.equinoxpub.com/Calico/article/view/16359.. Acesso em: 16 jul. 2024.