4Bralts V E. Finite element analysis of drip irrigation submain units [ J]. Trans. of ASAE,1985, 28(3) :809 -914.
5Anwar A A. Friction correction factors for center - pivots [ J ]. Journal of Irrigation and Drainage Engineering, 1999,125 ( 5 ) :280-286.
6Jensen M C, Fralini A M. Adjusted F factors for sprinkler lateral design [ J ]. Agricultural Engeering, 1957, 38 ( 4 ) :247.
7Li Aikeng(李蔼铿). A model to design micro - irrigation systems [ A]. Proc. of Fourth Internation - al Micro - Irrigation Congress [ C]. Aibury - Wodonga, Australia, 1988.