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Syahputri R, Rizaldi R, Rahayu E. Application Of Certainty Factor In Detecting Learning Concentration Disorders In Children At School. itej [Internet]. 25Aug.2025 [cited 13Mar.2026];10(2):307 -314. Available from: https://www.syekhnurjati.ac.id/journal/index.php/itej/article/view/277