Asaf, Z., Rubinstein, D. & Shmulevich I. (2006). Evaluation of link-track performances using DEM. Journal of Terramechanics, 43, 141-161.
Asaf, Z., Rubinstein, D. & Shmulevich I. (2007). Determination of discrete element model parameters required for soil tillage. Soil & Tillage Research, 92, 227-242.
Coetzee, C. J. & Els D. N. J. (2009). Calibration of granular material parameters for DEM modeling and numerical verification by blade-granular material interaction. Agriculture Engineering Research, 109, 63–84
Esehaghbeygi, A., Tabatabaeefar, A., Keyhani, A.R., & Raoufat M. H. (2005). Depth and rake angle’s influence on the draft force of an oblique blade subsoiler. Journal of Iranian Agricultural science, 364, 1045–1052. (In Farsi)
Gueirf, J. (1994). Effect of compaction on soil strength parameters. Series 11. Elsevier, Amsterdam, The Netherlands, pp.191-214.
Harrison, H. P. (1988). Soil reacting forces for a bentleg plow. Transaction of the ASABE, 31(1), 47-51.
Harrison, H. P. (1990). Soil reacting forces for two tapered bentleg plows. Transaction of the ASABE, 33(5), 1473-1476.
Itasca manual. (2005). PFC3D user’s guide, version 3.10., Itasca consulting group, Inc. Minneapolis, USA.
Kushwaha, R. L. & Zhang, Z. X. (1998). Evaluation of factors and current approaches related to computerized desing of tillage tool: A review. Journal of Terramechanics, 35(2), 69-86.
Luth, H.J. & Wismer, R.D. (1971). Performance of plane cutting blades in sand. Transaction of ASAE, 14(2), 255–262.
Momozu, M., Oida, A., Yamazaki, M. &. Koolen, A. J. (2003). Simulation of a soil loosening process by means of the modified distinct element method. Journal of Terramechanics, 39 (4), 207–220.
Oida, A., Schwanghart, H. & S. Ohakubo. (1999). Effect of tire lug cross section on tire performance simulated by distinct element method, In:Proceedings of the 13th International Conferenceof the ISTVS, Munich, Germany, pp.345–352.
Owen, D. (1989). Force-depth relationships in a pedogenetically compacted caly loam soil. Applied Egieering in Agriculture, 5 (2), 185-191.
Ramadan, M.N. (2014). Developmenet and performance evaluation of the double tines subsoiler in silty clay soil part1: draft force, disturbed area and specific resistance, Mesopotamia Journal of Agriculture, 42(1), 293-313.
Raoufat, M. H. & Mashhadi,H. (2000). Determination the distance between bent leg plow tines to get optimum tillage. Journal of Iranian Agricultural science, 3(2), 319-330. (In Farsi)
Shahi, N. & Shahgholi, G. (2010). Modeling soil and oscillatory tine interaction using discrete element method. McS dissertation, University of Mohaghegh Ardabili. (In Farsi)
Sohne, W. (1956). Einge grundlagen fur eine landtechnische bodenmechanik (Some basic considerations of soil mechanics as applied to agricultural engineering). Grundlage derland technic 7. Translation 53, Library, National Institute of Agricultural Engineering, Silsoe.
Shmulevich, I., Asaf, Z. & Rubinstein, D. (2007). Interaction between soil and a wide cutting blade using the discrete element method. Soil & Tillage Research, 97, 37-50.
Stafford, J.V. (1979). The performance of a rigid tine in relation to soil properties and speed. Journal of Agricultural Engineering Research, 24, 41–57.
Summers, J.O., Khalilian, A. & Batchelder, D. G. (1986). Draft relationships for primary tillage in Oklahoma soils. Transaction of the ASABE, 29 (1), 37 - 39.
Williams, M. (1981). Enter a new kind of plow. Power Farming Magazing, October, pp. 34-35.
Yan, W. M. (2009). Fabric evolution in numerical direct shear test. Computers geotechnics, 36, 597-603.
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