L. PIMENTEL, Jonald; U. ENOCK, Omar. The Effect of Retention Interval Over a Three Year Period on the Elementary Algebra Performance of High School Students. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 43, n. 2, p. 181–194, 2019. Disponível em: https://gssrr.org/JournalOfBasicAndApplied/article/view/9789. Acesso em: 12 sep. 2025.