Bernat, Tomasz. “A Maintenance of a Dominant Market Position – on the Example of the Polish Post Office”. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy 9, no. 4 (February 19, 2015): 9–20. Accessed April 25, 2024. https://apcz.umk.pl/EQUIL/article/view/EQUIL.2014.022.