L. Sumaratih, R. Soedono, and D. Aditianingsih, “The Comparison of High Flow Nasal Cannula Oxygen and Conventional Oxygen Therapy on Early Effect Hemodynamic Indicators in Post – Upper Abdominal Surgery Patients: A Pilot Study”, Bioscmed, vol. 3, no. 4, pp. 10–20, Oct. 2019, doi: 10.32539/bsm.v3i4.99.