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Ningsih Sagala P, Suhendro L P, Widyastuti E. Development Of First High School Mathematics LKPD Based On Case Method Integrated Local Culture Mandailing Tribe. IJERSC [Internet]. 2022Sep.1 [cited 2025Oct.10];3(4):1734-43. Available from: https://ijersc.org/index.php/go/article/view/463