1. HOGG, W. H. (1975). The orchard climates of the south and east. In:Climate and the orchard. (Ed. H. C. Pereira), Commonwealth Agricultural Bureaux, Farnham Royal, Slough, UK.
2. SMITH, L. P. (1967). Potential transpiration.Ministry of Agriculture Technical BulletinNo. 16, Her Majesty’s Stationery Office, London.