1. Andrade, E. N. DaCosta (1910), The viscous flow in metals and allied phenomena, Proc. Roy. Soc., 84.
2. Findley, W. N. and Gjelsvik, A. G. (1962) A biaxial testing machine for plasticity, creep or relaxation under variable principal stress ratios. Proc. Am. Soc. Test. Materials, 62, 1103–18.
3. Hayhurst, D. (1974) The effects of test variables on scatter in high temperature tensile creep-rupture data, Int. J. Mech. Sci., 16, 829–41.
4. Hostinsky, T. and Cadek, J. (1974) Stroj pro crepove zkousky w tahu pri konstantnim napeti. Kovove Materialy, 4, XII, Bratislava.
5. Ohashi, Y., Tokuda, M. and Yamashita, H. (1975) Effect of third invariant of stress deviator on plastic deformation of mild steel, J. Mech. Phys. Solids, 23, 295–323.