CLEMENS, J. Vi vaccine: options for assessing effectiveness. Medical Journal of Indonesia, [S. l.], v. 7, n. Supp1, p. 89, 1998. DOI: 10.13181/mji.v7iSupp1.1046. Disponível em: http://mji.ui.ac.id/journal/index.php/mji/article/view/1046. Acesso em: 17 feb. 2025.