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Witriyani. Effectiveness of Progressive Muscle Relaxation in Reducing Insomnia Severity Among Older Adults: Implementasi Relaksasi Otot Progresif Terhadap Penurunan Skala Insomnia Pada Lansia. IPK [Internet]. 2025 Jun. 4 [cited 2026 Feb. 28];4(1):35-46. Available from: https://e-journal.saku.co.id/index.php/IPK/article/view/368