Amarante, A.F.T.; Bricarello, P.A.; Rocha, R.A.; Gennari, S.M. (2004), "Resistance of Santa Ines, Suffolk and Ile de France sheep to naturally acquired gastrointestinal nematode infections.", Veterinary Parasitology, 120 (1–2): 91–106, doi:10.1016/j.vetpar.2003.12.004, PMID15019147
Amarante, A.F.T.; Bricarello, P.A.; Rocha, R.A.; Gennari, S.M. (2004), "Resistance of Santa Ines, Suffolk and Ile de France sheep to naturally acquired gastrointestinal nematode infections.", Veterinary Parasitology, 120 (1–2): 91–106, doi:10.1016/j.vetpar.2003.12.004, PMID15019147