1. Skrzypek J. and Ganczarski A.: Application of the orthotropic damage growth rule to variable principal directions, Int. J. Damage Mech., 7 (1998), pp. 180–206.
2. Kachanov L.M.: Time of the rupture process under creep conditions, lzv. AN SSR, Otd. Tekh. Nauk, 8 (1958), pp. 26–31.
3. Kachanov L.M.: Foundations of Fracture Mechanics, Nauka, Moscow, 1974, in Russian.
4. Rabotnov Ju.N.: Creep rupture, in: Proc. 12 Int. Congr. Appl. Mech., Stanford, Calif., 1968 pp. 342–349.
5. Martin J.B. and Leckie F.A.: J. Mech. Phys. Solids, 20 (1972), pp. 223.