Weibel, Daniel, Esther Schelling, Bassirou Bonfoh, Jürg Utzinger, Jan Hattendorf, Mahamat Abdoulaye, Toguina Madjiade, and Jakob Zinsstag. “Demographic and Health Surveillance of Mobile Pastoralists in Chad: Integration of Biometric Fingerprint Identification into a Geographical Information System”. Geospatial Health 3, no. 1 (November 1, 2008): 113–124. Accessed April 20, 2024. https://www.geospatialhealth.net/gh/article/view/237.