Lengeler, C; Kessler, W; Daugla, D. "The 1990 meningococcal meningitis epidemic of Sarh (Chad): how useful was an earlier mass vaccination?". Acta Trop. 59: 211–22. doi:10.1016/0001-706x(95)00081-o. PMID7572427.
"Station Sarh" (in French). Meteo Climat. Retrieved October 19, 2016.
nih.gov
pubmed.ncbi.nlm.nih.gov
Lengeler, C; Kessler, W; Daugla, D. "The 1990 meningococcal meningitis epidemic of Sarh (Chad): how useful was an earlier mass vaccination?". Acta Trop. 59: 211–22. doi:10.1016/0001-706x(95)00081-o. PMID7572427.