Deepak Bharati, Maria Alva, Simona D’souza, Sanya Lisboa, and Sohail Sayyed. “Comparative Systematic Review and Efficacy of Various Vaccines Against SARS-COV-2”. Journal of Innovations in Pharmaceutical and Biological Sciences, vol. 8, no. 4, Nov. 2021, pp. 01-13, https://jipbs.com/index.php/journal/article/view/412.