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Rika R, Nur K. Faktor Determinan Menurunnya Minat Belajar Matematika Anak Down Syndrome SDN Betet 1 Kediri (Determinants of Decreased Interest in Learning Mathematics Among Children with Down Syndrome at SDN Betet 1 Kediri). Happiness [Internet]. 2025 Jan. 7 [cited 2026 July 1];8(2):125-39. Available from: http://103.134.17.251/happiness/article/view/1158