[1] Hafez, A., Liu, Q., Finkbeiner, T. et al. “The effect of particle shape on discharge and clogging.” Sci Rep 11, 3309 (2021). https://doi.org/10.1038/s41598-021-82744-w

[2] John Carson and David Craig, “Standard Practice for Design and Construction of Concrete Silos and Stacking Tubes for Storing Granular Materials”. American Concrete Institute, ACI 313-97. Jenike & Johanson, Tyngsboro, MA. 1998 http://civilwares.free.fr/ACI/MCP04/313_97.pdf

[3] “Foundations for Conveyor Safety”. Ch.2, pg. 44. Martin Engineering. Worzalla Publishing Company, Stevens Point, Wisconsin. 2016. https://www.martin-eng.com/content/product/690/safety-book