Khotimah, Khusnul, and Alimatul Mahmudah. “Math Learning With Realistic Mathematics Education Approach Based On Open-Ended Problems”. APPLICATION: Applied science in Learning Research 1, no. 1 (June 21, 2021): 13–22. Accessed July 5, 2024. https://ejournal.unwaha.ac.id/index.php/application/article/view/1422.