Tatarczak, Anna, and Oleksandra Boichuk. “The Multivariate Techniques in Evaluation of Unemployment Analysis of Polish Regions”. Oeconomia Copernicana 9, no. 3 (September 30, 2018): 361–380. Accessed February 23, 2024. https://journals.economic-research.pl/oc/article/view/1045.