ULLAH, Md. Anayet. COVID 19 Vaccine Development: Timelines & Present Status. Barind Medical College Journal, [S. l.], v. 8, n. 1, p. 1–4, 2022. DOI: 10.70818/bmcj.2022.v08i01.0121. Disponível em: https://bmcj.org/index.php/bmcj/article/view/121. Acesso em: 3 oct. 2025.