1- Barfield, B. J. and Gerber, J. F. 1979. Modifying the Aerial Environmental ofCrops. St. Joseph. MI: ASAE.
2- Businger, J. A. 1965. Frost protection with irrigation. Agric. Meteorology. 6(28):
74-80.
3- Cranney, J. R. 1996. Apple crop outlook. Am. Fruit Grower. 116(9):6-7.
4- Gerber, J. F. and Harrison, D. S. 1964. Sprinkler irrigation for cold protection of citrus. Trans. of the ASAE. 7,464-468.
5- Gerber, J. F. and Martsolf, J. D. 1964. Sprinkling for frost and cold protection. Modification of the Aerial Environment of Crops. St. Joseph. Mich. ASAE.
6- Hamer, P. J. C. 1980. An automated sprinkler system giving variable irrigation rates matched to measured frost protection needs. Agric. Meteorol. 21,281-293.
7- Heisey, L. W., Heinemann, P. H., Morrow, C. T. and Crassweller, R. M. 1994. Automation of an intermittent overhead irrigation frost protection system for an apple orchard. Applied Eng. in Agric. 10(5): 669- 675.
8- Koc, A. B., Heinemann, P. H., Crassweller, R. M. and Morrow, C. T. 2000. Automated cycled sprinkler irrigation system for frost protection of apple buds. Applied Eng. in Agric. 16(3): 231-240.
9- Perry, K. B. 1979. Evaluation and refinement of sprinkler application rate models used in frost protection. ph.D. Thesis. Pennsylvania State University. University Park.
10- Perry, K. B. 1986. FROSTPRO, A model of overhead irrigation rates for frost/freeze protection of apple orchards. Hort. Sci. 21(4):1060-1061.
11- Stombaugh, T. S., Heinemann, P. H. Marrow, C. T. and Goulart, B. l. 1992. Automation of a pulsed irrigation system for frost protection of strawberries.Applied Eng. in Agric. 8(5): 597-602.
12- Westwood, M. N. 1991. Temper-Zone Pomology. Translated by: Rasoolzadegan. Isfahan University of Tchnology. Isfahan. Iran. (in Farsi)