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5. ASCE EWRI, 2005. The ASCE Standardized Reference Evapotranspiration Equation. Environmental and Water Resources Institute (EWRI) of the American Society of Civil Engineers Task Committee on Standardization of Reference Evapotranspiration Calculation, ASCE, Washington, DC, p. 70. Available online at (http://www.kimberly.uidaho.edu/water/asceewri/ascestzdetmain2005.pdf). Checked on 12.01.2012.