9ARRAYA K, GAO R. A non-linear three-dimensional finite element analysis of subsoiler cutting with pressurized air injection[J]. Agile Ergng Res,1995,61(2):115-128.
10MOUAZEN A M,NEMENYI M. Tillage tool design by the finite element method: Part 1. finite element modeling of soil plastic behaviour[J]. Agrie Engng Res, 1999,72 (1) : 37-51.
