YADAV, D. K.; SHRESTHA, N. Challenges of COVID-19 Vaccines. Journal of Health and Allied Sciences, [S. l.], v. 11, n. 1, p. I-II, 2021. DOI: 10.37107/jhas.324. Disponível em: https://www.jhas.org.np/jhas/index.php/jhas/article/view/324. Acesso em: 19 apr. 2024.