Djajalaksana S, Listyoko AS, Harjantho LT, Christanto A, Falyani SA, Yamasaki A. The Use of Mask in Respiratory Exercise in the Era of COVID-19 Pandemic. JR [Internet]. 2022 May 31 [cited 2025 Jun. 30];8(2):69-74. Available from: https://e-journal.unair.ac.id/JR/article/view/33019