Mengesha, Abebe, et al. “Multiplicity of Infection and Incubation Period for Fixed Rabies Virus Strains Propagation on BHK-21 and Vero Cell Lines”. Ethiopian Journal of Public Health and Nutrition (EJPHN), vol. 2, no. 2, Nov. 2018, pp. 83-86, https://ejphn.ephi.gov.et/index.php/ejphn/article/view/124.