1. Allen, R., Pereira, L.S., Raes, D., Smith, M., 1998. Crop evapotranspiration—guidelines for computing crop water requirements. FAO Irrigation and Drainage Paper No. 56. Rome, Italy.
2. The status of Quinoa (Chenopodium quinoa Willd.) in Oruro at the Altiplano of Bolivia;Barrientos,2004
3. Some methods for testing the homogeneity of rainfall records;Buishand;J. Hydrol.,1982
4. Carrasco, E., Devaux, A., Garcia, W., Esprella, R., 1997. Frost-Tolerant Potato Varieties for the Andean Highlands. CIP Program Report 1995–1996. Centro Internacional de la papa, Lima, Peru, pp. 227–232.
5. Centro Internacional de la Papa (CIP), 2005. DIVA GIS: Software Manual and Free GIS Data, http://www.diva-gis.org/ (accessed August 2005).