1. Assistant Professor, Faculty of Civil Engineering, Univ. of Nis, Beogradska 14, 18000 Nis, Serbia and Montenegro.
2. Resident Assistant, Faculty of Occupational Safety, Univ. of Nis, Carnojevica 10a, 18000 Nis, Serbia and Montenegro.
3. Professor, Faculty of Occupational Safety, Univ. of Nis, Carnojevica 10a, 18000 Nis, Serbia and Montenegro.