Kostadin Topourov
- A Problem of the Tall Highway Bridge. Presented at: 3. Internationale Donaubrückenkonferenz, 3rd International Conference on Bridges across the Danube, 29-30/10/1998, Regensburg, Germany. (1998):
- Erdbebensicherung von Stahlbetonbrücken. Presented at: 3. Internationale Donaubrückenkonferenz, 3rd International Conference on Bridges across the Danube, 29-30/10/1998, Regensburg, Germany. (1998):