Firkovič, Viktorija, and Rimantas Rudzkis. “The Comparison of Cointegration Methods Applications of Lithuanian’s Economy Modeling Results”. Lietuvos matematikos rinkinys 43, no. spec. (December 22, 2003): 468–474. Accessed November 26, 2025. https://www.zurnalai.vu.lt/LMR/article/view/32501.