ZAPLETAL, František - HERRERA-VIEDMA, Enrique. On the Efficiency of Steel Sectors in EU Member Countries. In Ekonomická revue. - Ostrava : VŠB - Technická univerzita Ostrava, Ekonomická fakulta, 2018. ISSN 1212-3951, 2018, vol. 21, no. 3, pp. 71-80.