HAJER, I. E.; HASSAN, A. M. . Production and Use of Veterinary Vaccines in Sudan. Journal of Veterinary Medicine and Animal Production, [S. l.], v. 9, n. 1, 2021. Disponível em: http://onlinejournals.uofk.edu/index.php/vet/article/view/219. Acesso em: 4 apr. 2025.