Olejnik, Iwona, and Robert Skikiewicz. 2015. “The K-Means Method in the Segmentation of Retirees on the Basis of Life Priorities”. Krakow Review of Economics and Management Zeszyty Naukowe Uniwersytetu Ekonomicznego W Krakowie, no. 916 (December): 83-94. https://doi.org/10.15678/krem.741.