Dimitrova M. Opportunities for improving congress tourismʼs competitiveness: Supervisor: Prof. Tichomir Pelov, Ph.D, University of National and World Economy, Sofia, Bulgaria Institution awarding the Ph. D. Degree: University of National and World Economy, Sofia, Bulgaria Date of defence: 25 th March 2010. EJTR [Internet]. 2010 Oct. 1 [cited 2025 Mar. 20];3(2):135-7. Available from: https://ejtr.vumk.eu/index.php/about/article/view/57