“Epidemiological Protection Factor of AstraZeneca and Sputnik V Vaccine in Inhabitants of the Department of Chontales. Nicaragua”. Revista Científica Estelí, no. 42 (August 8, 2022): 53–67. Accessed August 7, 2025. https://revistas.unan.edu.ni/index.php/Cientifica/article/view/2051.