1. Jenike, A. W.: Gravity Flow of Bulk Solids, Bull. of the University of Utah, Bull. No. 108 (1961).
2. Jenike, A. W.; Johanson, J. R.: Stress and Velocity Fields in Gravity Flow of Bulk Solids, Bull. of the University of Utah, Bull. No. 116 (1962).
3. Jenike, A. W.: Storage and Flow of Solids, Bull. of the University of Utah, Bull. No. 123 (1964).
4. De Boer, J. H.: Trans. Faraday Soc. 32 (1936) S. 10.
5. Hamaker, H. C.: Physica 4 (1937) S. 1058.