Concrete structures - stimulators of development : proceedings of the fib Symposium Dubrovnik 2007 organized by fib Croatian Member Group in association with Structural Engineering Conferences (SECON), Civil Engineering Institute of Croatia (IGH), University of Zagreb Faculty of Civil Engineering (GF), Dubrovnik, Croatia, May 20-23, 2007 - Radić, Jure, inženjer građevinarstva (Structural Engineering Conferences (SECON), 2007)