Moravcik, M., P. Kotes, M. Brodnan, and P. Kotula. “Some Experience from the Analysis of Existing 40 Years Old Prestressed Bridges in the North of Slovakia”. Communications - Scientific Letters of the University of Zilina, Vol. 16, no. 4, Dec. 2014, pp. 4-8, http://journals.uniza.sk/index.php/communications/article/view/569.