Juhász, Anikó, Antal Seres, and Márta Stauder. “Important Questions of the Methodology of Commercial Concentration”. The Hungarian Journal of Marketing and Management 39, no. 2 (December 1, 2019): 59–74. Accessed July 1, 2026. https://journals.lib.pte.hu/index.php/mm/article/view/1377.