[5] Maleki M R, Van Holm L, Ramon H, et al. Biosystems Engineering, 2006, 95(3): 425.
[6] Veras G, Silva E C, Silva Lyra W, et al. Talanta, 2009, 77(3): 1155.
[8] Kim H, Hummel J W, Sudduth K A, et al. Soil Science Society of America Journal, 2007, 71(6): 1867.