1. World Health Organization. On Twitter. https://twitter.com/WHO/status/1499029562562387971?s=20&t=NMR2UFapgq5AJTT9jBvIUQ. Accessed May 2, 2022.
2. Formulation of an oxygen policy to ensure adequate supply of oxygen reserves during the second wave of COVID-19 pandemic.Med Gas Res;Tiwari,2023
3. World Health Organization. COVID-19 oxygen emergency impacting more than half a million people in low- and middle-income countries every day, as demand surges. https://www.who.int/news/item/25-02-2021-covid-19-oxygen-emergency-impacting-more-than-half-a-million-people-in-low--and-middle-income-countries-every-day-as-demand-surges. Accessed May 31, 2022.
4. Perez-Pena R. Why some hospitals lack the oxygen to keep patients alive. New York Times. https://www.nytimes.com/2021/05/04/world/oxygen-shortage-covid.html. Accessed May 31, 2022.
5. Haider S. Covid -19 crisis. Center faces questions ove how it plans to use foreign aid. Hindu. https://www.thehindu.com/news/national/covid-19-crisis-france-sends-8-oxygen-generators-to-india/article61817257.ece. Accessed May 31, 2022.