(1)
Georgina Lukanova, G. L. Improving Service Effectiveness in the High-Class Hotels in Varna (Bulgaria): Supervisor: Assoc. Prof. Tanya Dabeva, PhD Institution Awarding the Ph. D. Degree: University of Economics-Varna, Bulgaria Th Date of Defence: 19 October 2012. EJTR 2013, 6, 88-91.