P. Pivonka, R. Lackner, and H. Mang, “Material modeling of concrete subjected to multiaxial loading: application to pull-out analyses”, Arch. Mech., vol. 53, no. 4-5, pp. 487–499, Sep. 2001, Accessed: Jan. 17, 2026. [Online]. Available: http://am.ippt.gov.pl/index.php/am/article/view/v53p487