1. 1950 1. Hill, R., The Mathematical Theory of Plasticity, Oxford University Press.
2. 1960 1. Filippov, A. F., Differential equations with discontinuous right-hand side (in Russian). Mat. Sbornik 51; A.M.S. Translations (2) 42 (1964), 199–231.
3. 1968 1. Mendelson, Alexander, Plasticity: Theory and Application, Macmillan, New York.
4. 1976 1. Krasnoselskii, M. A., A mathematical description of the oscillations of a material point on an elastic-plastic element, A.M.S. Translation (2) 105, 206–210.
5. 1979 1. Buhite, J. L., & D. R. Owen, An ordinary differential equation from the theory of plasticity, Arch. Rational Mech. Anal. 71, 357–383.