KRAVEC, Michal - SLIVKOVÁ, Adela. Cluster Analysis of Steel Industry. In Interdisciplinarity in theory and practice : journal for presentation of interdisciplinary approaches in various fields. - Arad : Adoram, 2013. ISSN 2344-2409, 2013, nr. 2, pp. 110-117 online. Dostupné na : <http://www.itpb.eu/index.php/ct-menu-item-3/15-economics/69-cluster-analysis-of-steel-industry>