Sharan Badiger and  Prema T. Akkasaligar and  P. Amith Kumar ,  A Study of Cardio Pulmonary Changes during Upper Gastrointestinal Endoscopy.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 83(11). 757 - 766
    [viewed 02 May 2024]. Available from: https://publications.waset.org/pdf/9997231.