Pal, Gopal, and Nivedita Nanda. “Asanas in Prone Posture and Slow Pranayamas Can Prevent Respiratory Complications in COVID-19 Patients”. International Journal of Clinical and Experimental Physiology 7, no. 3 (October 6, 2020): 89-90. Accessed September 23, 2021. https://ijcep.org/index.php/ijcep/article/view/547.