1. Poudres et Grains;Sables,1997
2. Statics and Kinematics of Granular Materials;Nedderman,1992
3. The legacy of neglect in the U.S.;Ennis;Chemical Engineering Progress,1994
4. L-valves characterized for solids flow;Knowlton;Hydrocarbon Process,1978
5. Granular flow in a solar hexagonal silo;Joseph,1996