Kszczotek M, Kiermasz B, Cisek M. Informational efficiency of the Polish capital market in a weak form, based on the example of companies from the WIG20 index. SPE [Internet]. 2021 May 13 [cited 2024 Apr. 29];118:249-64. Available from: https://journals.ltn.lodz.pl/Studia-Prawno-Ekonomiczne/article/view/1233