Bejger, Sylwester. “Wholesale Fuel Price Adjustment in Poland: Examination of Competitive Performance”. Ekonomia i Prawo. Economics and Law 18, no. 4 (December 31, 2019): 385–412. Accessed July 23, 2024. https://apcz.umk.pl/EiP/article/view/EiP.2019.026.