● Vannini C,Ferrantini F,Schleifer KH,Ludwig W,Verni F,Petroni G (2010). "Candidatus anadelfobacter veles" and "Candidatus cyrtobacter comes," two new rickettsiales species hosted by the protist ciliate Euplotes harpa (Ciliophora, Spirotrichea). Appl. Environ. Microbiol.76, 4047-54.