Łobos, Krzysztof, and Mirosława Szewczyk. 2012. “Factors Affecting EBIT of Companies Engaged in Quarrying of Stone in Opolskie Voivodship and Dolnośląskie Voivodship”. Regional Barometer. Analyses & Prognoses, no. 2 (28) (September):57-63. https://doi.org/10.56583/br.1238.