JACOB, Ogunode Niyi. Investigation into the Challenges Facing Planning of Mathematic Programme in Senior Secondary Education in Abuja, Nigeria. Journal of Education and Learning Mathematics Research (JELMaR), [S. l.], v. 1, n. 2, p. 91–103, 2020. DOI: 10.37303/jelmar.v1i2.78. Disponível em: https://jelmar.wisnuwardhana.ac.id/index.php/jelmar/article/view/78. Acesso em: 25 aug. 2026.