Sej-Kolasa, Małgorzata, and Mirosława Sztemberg-Lewandowska. “The Analysis of Changes over Time in the Number of Students Using Functional Principal Component Analysis in European Countries”. Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie, no. 916 (December 16, 2015): 71–81. Accessed November 10, 2024. https://krem.uek.krakow.pl/index.php/krem/article/view/740.