PENICHE-LARA, Gaspar, et al. “Rickettsia Typhi IN RODENTS AND R. Felis IN FLEAS IN YUCATÁN AS A POSSIBLE CAUSAL AGENT OF UNDEFINED FEBRILE CASES”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 57, no. 2, Apr. 2015, pp. 129-32, https://revistas.usp.br/rimtsp/article/view/100941.