WEIBEL, D.; SCHELLING, E.; BONFOH, B.; UTZINGER, J.; HATTENDORF, J.; ABDOULAYE, M.; MADJIADE, T.; ZINSSTAG, J. Demographic and health surveillance of mobile pastoralists in Chad: integration of biometric fingerprint identification into a geographical information system. Geospatial Health, v. 3, n. 1, p. 113-124, 1 nov. 2008.