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 October 27, 2025. https://test.zurnalai.vu.lt/LMR/article/view/32214.