1. R. G. Green, ?Theory of plasticity of porous solids,? in: Mechanics [Russian translation], Vol. 4 (1973), pp. 109?120.
2. H. A. Kuhn and C. L. Downey, ?Deformation characteristics and plasticity theory of sintered powder materials,? Intern. J. Powder Met.,7, No. 1, 15?25 (1971).
3. M. Ogane, T. Kawakami, and S. Shima, ?Plasticity theory for porous metals and its application,? J. Jpn. Soc. Powder Met.,20, No. 5, 142?146 (1973).
4. V. E. Perel'man, P. I. Perlin, and O. V. Roman, ?Calculation of stress and density fields in the pressing of metal powders,? Poroshk. Metall., No. 9, 14?18 (1971).
5. I. S. Degtyarev, ?Stress discontinuities in extremal theorems for compressible plastic materials,? Prikl. Mat. Mekh., No. 8, 709?716 (1975).