1. V. V. Sokolovsky,Theory of Plasticity [in Russian], Vysshaya Shkola, Moscow (1969).
2. Z. Mroz and A. Dresher, “Limit plasticing approach to some cases of flow bulk solids,”Trans. Am. Soc. Mech. Eng., Paper No. 68, MN 23.
3. Z. Mroz and Cz. Szymansky, “Gravity flow of granular materials in a converging channel,”Arch. Mech.,23 (1971).
4. L. V. Gyachev,Movement of Flowing Materials in Pipes and Hoppers [in Russian], Mashinostroeniye, Moscow (1968).
5. A. Ph. Revuzhenko, S. B. Stazhevsky, and Ye. I. Shemyakin, “On the asymmetry of plastic flow in a converging symmetric channel,”Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., No. 3 (1977).