S. Hudz, N. Ichanska, S. Rendyuk, and P. Molchanov, “Optimization of the double-span purlins design sketch in a framework with portal frames through the rafter stays application”, ZNP, vol. 1, no. 56, pp. 30–36, Jun. 2022, doi: 10.26906/znp.2021.56.2504.