[[1] CEMA (1971): Screw Conveyors Handbook No. 350. Washington, USA: Conveyor Equipment Manufacturers Association, 140 p.]Search in Google Scholar
[[2] Schulze, D. (2006): The behaviour of powders and bulk solid, renewed 7/7/2006 [cited 3/24/2016]. Available on: <http://www.dietmar-schulze.de/grdle1pr.html>.]Search in Google Scholar
[[3] Stepanoff, A.J. (1969): Gravity Flow of Bulk Solids and Transportation of Solids in Suspensions. New York: John Wiley & Sons 1969; 191 p.]Search in Google Scholar
[[4] Schulze, D. (2006): Stresses in Silo, renewed 7/7/2006 [cited 4/5/2016]. Available on: < http://www.dietmar-schulze.de/spannepr.html > .]Search in Google Scholar
[[5] Van der KOOI, P.J. (1997): Silo design: Well Begun is Half Done. Powder Handling & Processing, 9 (4), pp. 326-329.]Search in Google Scholar
[[6] Arnold, P.C. (2001): Some Observations on the Importance of Particle Size in Bulk Solids Handling. Powder Handling & Processing, 13 (1), pp. 35-40.]Search in Google Scholar
[[7] Schulze, D. (2014): Flow Properties of Powders and Bulk Solids and Silo Design for Flow, renewed in 2014 [cited 3/24/2016] Available on: <http://www.dietmar-schulze.de/powtve.pdf >.]Search in Google Scholar
[[8] Schwedes, J. (2000): Testers for measuring flow properties of particulate solids. Powder Handling & Processing, 12 (4), pp. 337-354.]Search in Google Scholar
[[9] De Silva, S.R. (2000): Characterization of particulate materials. Powder Handling & Processing, 12 (4), pp. 355-363. ]Search in Google Scholar
