6Tang Yue, Liu Junping, Luo Yin, et al. Experimental study on lawn sprinkler for energy-saving and variable range of the preci- sion spraying[C]// Beijing: Computer and Computing Technolo- gy in Agriculture II Volume 24,2009.
7Xingye Zhu,Shouqi Yuan. Strategy of energy-saving for variable- rate irrigation sprinkler[C]// International Conference on Engi- neering Computation, 2009.