1. Allen, R.G., 1993. Evaluation of a Temperature Difference Method for Computing Grass Reference Evapotranspiration. Report submitted to FAO, Rome.
2. Allen, R.G., 1995. Evaluation of Procedures for Estimating Mean Monthly Solar Radiation from Air Temperature. Report prepared for FAO, Rome.
3. Assessing integrity of weather data for reference evapotranspiration estimation;Allen;J. Irrig. Drain. Eng.,1996
4. Self-calibrating method for estimating solar radiation from air temperature;Allen;J. Hydrol. Eng.,1997
5. Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO Irrig. Drain. Pap. 56, FAO, Rome, 300 p.