Infection by Rickettsia bellii and candidatus "Rickettsia amblyommii" in Amblyomma neumanni ticks from Argentina - Labruna, Marcelo Bahia; Pacheco, Richard de Campos; Nava, Santiago; Brandão, Paulo Eduardo; Richtzenhain, Leonardo José; Guglielmone, Alberto Alejandro (Microbial Ecology, 2007)