1. Failure of reinforced concrete grain silos;Theimer;Trans. ASME, Ser. B, J. Engng Ind.,1969
2. Forces on the walls and stagnation zones in a hopper filled with granular material;Ristow;Physica A,1995
3. A. W. Jenike, Storage and flow of solids, Utah Eng. Expt. Stat. Bull. 123 (1964).
4. Pattern formation and complexity in granular flows;Behringer,1994
5. Versuche über Getreidedruck in Silozelen;Janssen;Z. Ver. Dtsch Ing.,1895