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Tarigan APS, Juliandi J. PERNAFASAN PURSED LIP BREATHING MENINGKATKAN SATURASI OKSIGEN PENDERITA PENYAKIT PARU OBSTRUKTIF KRONIS (PPOK) DERAJAT II. Keperawatan [Internet]. 2019 Jan. 28 [cited 2024 Dec. 3];1(2):39-46. Available from: http://601341.annawisefintch.tech/index.php/Keperawatan/article/view/426