1. G. S. Pisarenko and A. A. Lebedev, Deformation and Strength of Materials in State of Complex Stress [in Russian], Naukova Dumka, Kiev (1976).
2. V. A. Pavlov, Physical Foundations of Cold Forming of BCC Metals [in Russian], Nauka, Moscow (1978).
3. G. Blahavec, ?Influence of normal stress on yielding behavior in Fe-3.2% Si alloy single crystals,? Czechoslovak J. Phys.,B23, No. 1, 62?71 (1973).
4. I. Takevchi, E. Kuramoto, and N. Suzuki, ?Orientation dependence of slip in tantalum single crystals,? Acta Met.,20, No. 7, 80?90 (1972).
5. L. Lejcek, ?Method of an approximate solution of the Peierls-Nabarro equations for nonplanar screw dislocation cores,? Czechoslovak J. Phys.,B29, No. 2, 196?202 (1979).