Kobylińska, Małgorzata. “Observation Depth Measure in a Sample in the Voivodeship Classification of the Property Market”. Olsztyn Economic Journal 8, no. 4 (December 31, 2013): 373–382. Accessed May 19, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3354.