Tanikawa, A. et al. 2013. A survey for rickettsial agents on Rhipicephalus sanguineus (Ixodida, Ixodidae) ticks in Northeastern Brazil. Brazilian Journal of Veterinary Research and Animal Science. 50, 5 (Oct. 2013), 414–417. DOI:https://doi.org/10.11606/issn.2318-3659.v50i5p414-417.