Talar, Sylwia. “The Intensity of Competition in the Era of Ubiquitous Internet Usage”. Acta Universitatis Lodziensis. Folia Oeconomica 3, no. 321 (October 10, 2016): [99]-113. Accessed July 24, 2024. https://czasopisma.uni.lodz.pl/foe/article/view/617.