Mărginean, Silvia, and Ramona Toma. “Some Issues Concerning Sector Concentration. Evidence from Romania”. Journal of Business Economics and Management 12, no. 1 (April 12, 2011): 110-130. Accessed July 2, 2024. https://jbem.vilniustech.lt/index.php/JBEM/article/view/4991.