KOLAIB, T. M.; SABRY, R. M. Heterologous COVID-19 vaccinations of Covishield/Astrazenica and Pfizer/Biontech: a case report. International Journal of Research in Medical Sciences, [S. l.], v. 9, n. 11, p. 3454–3456, 2021. DOI: 10.18203/2320-6012.ijrms20214428. Disponível em: https://www.msjonline.org/index.php/ijrms/article/view/10207. Acesso em: 19 sep. 2025.