KAZANDZHIEVA, V. Impact of e-commerce on travel intermediaries in Bulgaria: Supervisor: Assoc. Prof. Marin Neshkov, PhD Institution awarding the Ph. D. Degree: University of Economics-Varna th Date of defence: 21 October 2011. European Journal of Tourism Research, [S. l.], v. 5, n. 1, p. 84–88, 2012. DOI: 10.54055/ejtr.v5i1.97. Disponível em: https://ejtr.vumk.eu/index.php/about/article/view/97. Acesso em: 16 oct. 2026.