Comparison of Fuzzy Time Series Chen and Cheng to Forecast Indonesia Rice Productivity. EduMa: Mathematics education learning and teaching, [S. l.], v. 11, n. 1, p. 119 – 128, 2022. DOI: 10.24235/eduma.v11i1.10936. Disponível em: https://journal1.uinssc.ac.id/index.php/eduma/article/view/10936. Acesso em: 28 may. 2026.