Apparent absence of cryptosporidium, giardia and toxoplasma gondii in three species of penguins along the antarctic peninsula

1. Palacios, M.J.
2. Barbosa, A.
3. Pedraza-Daz, S.
4. Ortega-Mora, L.M.
5. Valera, F.
6. Cuervo, J.J.
7. Benzal, J.
8. De La Cruz, C.