1. Associate Professor, Dept. of Concrete Structures and Bridges, Technical Univ. of Košice, Vysokoškolská 4, SK-042 00 Košice, Slovakia. E-mail: marian.rovnak@tuke.sk
2. Associate Professor, Dept. of Steel and Timber Structures, Technical Univ. of Košice, Vysokoškolská 4, SK-042 00 Košice, Slovakia.