1. Oxfam. Campaigners warn that 9 out of 10 people in poor countries are set to miss out on covid-19 vaccine next year. 9 Dec 2020. https://www.oxfam.org/en/press-releases/campaigners-warn-9-out-10-people-poor-countries-are-set-miss-out-covid-19-vaccine.
2. LaFraniere S, Thomas K, Weiland N. Trump administration officials passed when Pfizer offered months ago to sell the US more vaccine doses. New York Times 2020 Dec 7. https://www.nytimes.com/2020/12/07/us/trump-covid-vaccine-pfizer.html.