Madubun, Safira Eka Putri, Ony Wibriyono Angkejaya, Bertha Jean Que, Felmi de Lima, and Christiana Rialine Titaley. 2023. “EtCO2 Levels in Medical Students Wearing N95 Masks”. Jurnal Respirasi 9 (3):169-75. https://doi.org/10.20473/jr.v9-I.3.2023.169-175.