1. Tong J, Ren L, Chen B, Qaisrani A R. Characteristics of adhesion between soil and solid surfaces. Journal of Terramechanics, 1994, 31, 93–105.
2. Qaisrani A R, Chen B C, Ren L Q. Modified and unsmoothed plow surfaces: A means to reduce plowing resistance. International Agricultural Engineering Journal, 1992, 1, 115–124.
3. Tong J, Ren L, Chen B. Geometrical morphology, chemical constitution and wettability of body surfaces of soil animals. International Agricultural Engineering Journal, 1994, 3, 59–68.
4. Tong J, Sun J, Chen D, Zhang S. Geometrical features and wettability of dung beetles and potential biomimetic engineering applications in tillage implements. Soil & Tillage Research, 2005, 80, 1–12.
5. Ren L, Xu X, Chen B, Cui X, Wang Y, Zhang B, Ge L, Jin G. Initial research on claw shapes of the typical soil animals. Transactions of the Chinese Society of Agricultural Machinery, 1990, 21(2), 44–49. (in Chinese)