Ortiz, O., Winters, P., Fano, H., Thiele, G., Guaman, S., Torrez, R., . . . Hakiza, J. (1999). Undrstanding farmers´ responses to late blight: Evidence from Peru, Boivia, Ecuador and Uganda.

Ortiz, O., P. Winters, H. Fano, Graham Thiele, S. Guaman, R. Torrez, Víctor Hugo Barrera, José Reinaldo Unda Galarza, and J. Hakiza. Undrstanding Farmers´ Responses to Late Blight: Evidence From Peru, Boivia, Ecuador and Uganda. 1999.

Ortiz, O., et al. Undrstanding Farmers´ Responses to Late Blight: Evidence From Peru, Boivia, Ecuador and Uganda. 1999.