Amin,E.A .1994. Development a grading machine for some horticulture farm crops . J. Agric . Sci., MansouraUniv.,19 (7) : 2399-2411.
Amin, E.E.A. 2003. Effect of some physical and mechanical properties on grading efficiency. The 11th Annual Conference of Misr Society of Agr. Eng. Oct.2003 : 451-470.
Barger,E.I., B.L.Eohi, W.M.Carleton and E.G. Mckibben .1963. Tractor and their power unit.2nd ed., Wiley and Sons.Inc.,N.Y.
El-shal, H, M.S. 2007. Development of an equipment for corn shelling . Ph.D. Thesis. Agric. Eng. Dept., Fac of Agric ZagazigUniv.
Fouad, H., M.N. Awady, G.B., Hanna, and M. Abou El-Kheir.1981. Optimal operation conditions for shelling maize with a rasp-bar cylinder. J.Col.Agric.Unir.Riyadh,3:31-42
Hunt, D .1983 . Farm power and machinery management. Iowa State University Press, AMER,2nd ed .pp.63-77.
Ismail, F.H .1981. Engineering and technological study on cleaning and grading crops.M.Sc.Thesis, Agric.Mech. Dept., Faculty of Agric., MansouraUniv.
Kepner, R.A., Roy Bainer and E.L. Barger .1982 .Principles of farm machinery. The AVI Publishing Co.Inc.,West Port, Connecticut, U.S.A; 392-431.
Metwalli,M.M., M.A.Helmy,S.M.Gomma, and M. E. Badawy. 1995. Evaluation of some parameters affecting corn sheller performance. Misr. J. Agric. Eng., 12(2): 439-455.