ZULKARDI; PRAHMANA, R. C. I.; PUTRI, R. I. I. In memory of Jan de Lange and Kees Hoogland: Honoring their legacy and contributions to mathematics education in Indonesia. Journal on Mathematics Education, [S. l.], v. 16, n. 2, p. 753–762, 2025. DOI: 10.22342/jme.v16i2.pp753-762. Disponível em: https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3839. Acesso em: 28 jul. 2025.