Implementing STEM-Based Mathematics Learning in Indonesian High Schools: Teachers’ Understanding, Challenges, and Supporting Factors. Riemann: Research of Mathematics and Mathematics Education, [S. l.], v. 8, n. 1, p. 142–158, 2026. DOI: 10.38114/riemann.v8i1.176. Disponível em: https://journal.sanagustin.ac.id/index.php/reimann/article/view/176.. Acesso em: 12 may. 2026.