Roza Lia M, Harmadi H, Muttaqin A. Development of Measuring Instruments for Lung Vital Capacity and Human Respiratory Rate Based on Fiber Optic Sensors. J. Ilmu Fis. [Internet]. 2022 Dec. 30 [cited 2024 Dec. 19];15(1):39-47. Available from: http://jif.fmipa.unand.ac.id/index.php/jif/article/view/517