Shrestha, P. S., M. N. Marhatta, S. P. Acharya, and N. Shrestha. “Comparison of Percutaneous Dilatational Tracheostomy With Open Tracheostomy in Intensive Care Unit”. Journal of Institute of Medicine Nepal, vol. 41, no. 1, Apr. 2019, pp. 1-7, https://nepjol.info/index.php/JIOM/article/view/28584.