Y. Li, Z. Zhao, and J. Chen, Discrete Element Method Simulation of Seeds Motion in Vibrated Bed of Precision Vacuum Seeder. Transaction of the Chinese Society for Agricultural Machinery, pp.56-60, 2009.

Y. Sun, C. Ma, and X. Niu, Discrete Element Analysis and Animation of Soybean Precision Seeding Process Based on CAD Boundary Model. Transaction of the Chinese Society for Agricultural Machinery, pp.45-48, 2006.

J. Yu, Y. Shen, and X. Niu, DEM Simulation and Analysis of the Clearing Process in Precision Metering Device with Combination Inner-cell. Transactions of the CSAE, pp.105-109, 2008.

J. R. Williams and N. Rege, The development of circulation cell structures in granular materials undergoing compression, Powder Technology, vol.90, issue.3, pp.187-194, 1997.
DOI : 10.1016/S0032-5910(96)03201-9

A. Dziugys and B. Peters, A new approach to detect the contact of two-dimensional elliptical particles, International Journal for Numerical and Analytical Methods in Geomechanics, vol.47, issue.15, pp.1487-1500, 2001.
DOI : 10.1680/geot.1997.47.2.319

A. Liu and S. Liu, Zhonggang Pan: Numerical Simulation of Movement of Solid Particles in a Vibrating Feeder, Journal of the Graduate School of the Chinese Academy of Sciences, vol.19, issue.1, pp.35-42, 2002.

P. A. Cundall, O. Strack, and . Dl, A discrete numerical model for granular assemblies, G??otechnique, vol.29, issue.1, pp.47-65, 1979.
DOI : 10.1680/geot.1979.29.1.47

Y. Zhao, M. Zhang, and P. Xu, etal: Discrete element simulation of the microscopic mechanical structure in sandpile, Acta Physica Sinica, vol.58, issue.3, pp.1819-1825, 2009.

Y. Zhao and M. Zhang, Jinyang Zheng: Discrete element simulation of the segregation in Brazil nut problem, Acta Physica Sinica, vol.58, issue.3, pp.1812-1818, 2009.