1. Anon. (National Weather Service, Climate Prediction Center) 1998 http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/ensoyears.shtml
2. Seed distribution constrains the dynamics of the Patagonian steppe;Aguiar;Ecology,1997
3. Ayesa , J. Barrios , D. 1999
4. Seedling recruitment in a semi-arid steppe;Barbera;Journal of Applied Ecology,2006
5. Comunidades herbáceas del Norte de la Patagonia y sus relaciones con la ganadería;Boelcke;Revista de Investigaciones Agropecuariàs,1957