M. Saran and M. Kleiber, “A Note on the Perturbation Approach to Nonlinear Static Analysis of Elastic Plane Trusses”, Eng. Trans., vol. 32, no. 3, pp. 315–327, Sep. 1984, Accessed: Jan. 17, 2026. [Online]. Available: http://et.ippt.gov.pl/index.php/et/article/view/1899