1. Daily reference evapotranspiration estimates by the “Copais” approach
2. Allen, R.G., Pereira, L.S., Raes, D., and Smith, M. (1998). “Crop evapotranspiration: Guidelines for computing crop water requirements.” Irrigation and Drainage Paper No. 56, Food and Agricultural Organization of the United Nations, Rome.
3. FAO‐24 Reference Evapotranspiration Factors
4. Comparison of Methods for Estimating REF-ET
5. ASCE-EWRI. (2005). The ASCE Standardized Reference Evapotranspiration Equation. Technical Committee report to the Environmental and Water Resources Institute of the American Society of Civil Engineers from the Task Committee on Standardization of Reference Evapotranspiration. ASCE