Tirtha Ratan Ghosh, et al. “Validation of Two Preoxygenation Techniques, 3 Min Tidal Volume Breath and Eight Vital Capacity Breath Techniques in Tribal and Non-Tribal Population of Eastern India”. Asian Journal of Medical Sciences, vol. 14, no. 5, May 2023, pp. 29-34, https://nepjol.info/index.php/AJMS/article/view/50930.