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Yannarut P, Kasemsukpipat W, Somchaipeng T. A Study of Mathematical Concept of Mathayomsuksa 3 Students by Using a Concept Attainment Model. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University [Internet]. 2022 Sep. 30 [cited 2024 May 9];16(2):726-38. Available from: https://so01.tci-thaijo.org/index.php/GraduatePSRU/article/view/244291