Gangoue-Pieboji, J., S. Koulla-Shiro, P. Ngassam, D. Adiogo, and P. Ndumbe. “Antimicrobial Activity Against Gram Negative Bacilli from Yaounde Central Hospital, Cameroon”. African Health Sciences, vol. 6, no. 4, July 2007, doi:10.4314/ahs.v6i4.6959.