1. A. A. Il'yushin, Plasticity [in Russian], Moscow, 1963.
2. A. M. Freudenthal and H. Geiringer, The Mathematical Theories of the Inelastic Continuum, Springer Verlag, Berlin, 1958.
3. E. H. Lee, Proc. 1st Symp. on Naval Struct. Mechan., New York, 1960.
4. H. Ziegler, Ztschr. f. angew. Math. u. Phys., 9, 1958.
5. P. M. Ogibalov and Yu. V. Suvorova, Mechanics of Reinforced Plastics [in Russian], Moscow, 1965.