Kleiza, Vytautas, and Jonas Bareišis. “The Optimization of a Multilayer Structural Element in Plasto-Elastic Zone”. Lietuvos matematikos rinkinys 44, no. spec. (December 17, 2004): 639–643. Accessed August 17, 2024. https://www.journals.vu.lt/LMR/article/view/32214.