1. 1) E.L. ROBINSON: Trans. ASME, 74 (1952), p.777
2. 2) NRIM Creep Data Sheet No. 3A (1976), [National Research Institute for Metals]
3. 3) R.L. KLUEH: Proceedings of the Second International Conference On Mechanical Behavior of Materials (ICM II), (1976) p.16
4. 4) R.F. JOHNSON, Joint Conference on High-tenperature Properties of Steels by BISRA and ISI, Eastbourne, Paper 13 (1966)