Abbaspour Fard, M. H., Emadi, B. and Khojastehpour, M. 2009. Effect of particle shape on bed structure and flow characteristics of materials discharged from a Hopper using a DE model. J. Agric. Sci. Nat. Res. 15(6): 233-242. (in Farsi)

Abou-Chakra, H. and Tuzun, U. 1999. Coefficient of friction of binary granular mixtures in contact with a smooth wall. PART I: Direct shear box measurements of the effects of particle size ratio and particle surface roughness. Chem. Eng. Sci. 54, 5901-5912.

Beverloo, R. 1961. The flow of granular solids through orifices. Chem. Eng. Sci. 15, P 262.

Casandroiu, T. and Mieila, C. 2010. Theoretical development of a mathematical model to evaluate gravimetrical flow rate of seeds through orifices. U. P. B. Sci. Bull. 72, 269-280.

Chang, C. S. and Converse. H. H. 1998. Flow rates of wheat and sorghum through horizontal orifices. Ame. Soc. Agric. Eng. 31, 300-304.

Choi, J., Kudrolli, A. and Bazant, M. Z. 2005. Velocity profile of granular flows inside silos and hoppers. J. Physics. 17, 2533-2548.

Cleary, P. W. 1999. The Effect of particle Shape on hopper discharge. 2^nd International Conference on CFD in the Minerals and Process Industries. Melbourne, Australia. 111-122.

Fedler, C. B.1988. Modelling applications in agricultural engineering: Mathematical models describing the flow of granular material. J. Matt. Comput. Model. 11, 510-513.

Fowler, R. T. and Glastonbury, J. R. 1958. The flow of granular solids through orifices. Chem. Eng. Sci. 10, 150-156.

Gregory, J. M. and Fedler, C. B. 1987. Equation describing granular flow through circular orifices. Trans. ASAE. 30(2), 529-532.

Karimi, H. 2005. Iran herbs Culture (trees, shrubs, flowers, homemade types of plants). Flag Pub. 2, 295.  (in Farsi)

Khanavi, M., Haj Akhundi, A., Sadeghi pour, H. R., Vosughi, M. and Arbabi, R. A. 2007. The influence of alcohol extracts of neem fruits (Meliaindica L.( and Persian lilac) Meliaazedarach L.( fruits on fertility of rats. J. Reproduct. Infer. 7-16. (in Farsi)

Mabrouk, R. and Chaouki, J. 2007. Wall surface effects on particle-wall friction factor in upward gas-solid flows. Powder Technol. 186, 80-88.

Mieila, C. and Casandroiu, T. 2009. Aspects regarding influence of geometrical shape of orifices about seeds gravimetric flow rate. Agric. Eng. 28(2): 43-48.

Mohsenin, N. N. 1978. Physical properties of plant and animal materials. Gorden and breach science publishers, NewYork.

Mortazavi, A. Saifkordi, A. Sadeghi, A. Gholamhossein Pour, A. 2009. Introduction to Food Engineering.  Ferdowsi University of Mashhad Pub. Vol(1). (in Farsi)

Nedderman, R. M. 1985. The Flow of Granular Materials through Orifices.  Particle Technol. 91, 281-294.

Nedderman, R. M. 1992. Statics and Kinematics of Granular Materials. Cambridge: Cambridge University Press.

Oldal, I., Keppler, I., Csizmadia, B. and Fenyvesi, L. 2011. Outflow properties of silos: The effect of arching. Adv. Powder Technol. 23, 290-297.

Razavi, M. A. and Akbari, R. 2006. Biophysical Properties of Agricultural and Food Materials. Ferdowsi University of Mashhad Pub. (in Farsi)

Zarandi, M.,  Ghazanfari Moghadam, A. and  Noorbakhsh, S. 2011. Investigating and Modeling the process of dehulling Persian Lilac fruits using Sodium Hydroxide with different concentrations and temperatures. Sci. J. Agric. 34(1): 57-64. (in Farsi)