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Mhd. Mahmudi Zukri Lubis, Yusuf Ramadhan Nasution, and Aidil Halim Lubis, “Implementation of Spaced Repetition Using the SuperMemo 2 Algorithm in Memorizing Qur’anic Verses”, esaprom, vol. 5, no. 04, pp. 698–715, Apr. 2026.