1. Allen, R.G. (1993) Evaluation of a temperature difference method for computing grass reference evapotranspiration. Water Res. Dev. Manag. Service, FAO, Rome (in press)
2. Allen, R.G., Smith, M., Perrier, A., and Pereira, L.S. (1994a) An update for the definition of reference evapotranspiration. ICID Bulletin, 43 (2): 1–34.
3. Allen, R.G., Smith, M., Pereira, L.S. and Perrier, A. (1994b). An update for the calculation of reference evapotranspiration. ICID Bulletin, 43 (2): 35–92.
4. André, J.C., Goutorbe, J.P., Perrier, A. and al. (1988) Evaporation over land-surfaces: first results from Hapex-Mobilhy special observing period. Ann. Geophys 6, 477–492.
5. Angström, A. (1924) Solar and terrestrial radiation. Quart. J. Roy. Meteorol. Soc 50, 121–125.