Septiani R, Firmansyah D. Mapping Cognitive Breakdown in Mixed Integer Operations: A Newman Error Analysis of Secondary Students’ Problem-Solving. Didact. Math. [Internet]. 2026 Mar. 12 [cited 2026 Jun. 16];8(1):67-82. Available from: https://www.ejournal.unma.ac.id/index.php/dm/article/view/16978