Kowalewski, Z.L. “Biaxial Creep Study of Copper on the Basis of Isochronous Creep Surfaces”. Archives of Mechanics 48, no. 1 (January 1, 1996): 89–109. Accessed January 17, 2026. http://am.ippt.gov.pl/index.php/am/article/view/v48p89.