1. Aguado, P, J, Ayuga, F, Guaita, M, 1997, Comparative evaluation of numerical methods for predicting flow and stress fields in silos. Filling of a Silo, Universidad Politécnica de Madrid Group Contribution
2. User's Manuals for Revision 5.3,1998
3. Traite Mecanique des Sols. [Treatise on soil mechanics.];Caquot,1956
4. DIN 1055 Part 6, 1987, Design loads for buildings. Loads in silo bins
5. Drescher, A, 1978, Kinematics of the mass flow of granular material through a plane hopper Geo. 28, 27, 42