Kosiorowski, Daniel, Dominik Mielczarek, and Jerzy Piotr Rydlewski. “A Critical Study of Usefulness of Selected Functional Classifiers in Economics”. Acta Universitatis Lodziensis. Folia Oeconomica 2, no. 347 (April 3, 2020): 71–90. Accessed April 29, 2024. https://czasopisma.uni.lodz.pl/foe/article/view/3960.