V. Pavković, G. Jević, J. Jević, P. T. . Nguyen, and C. Sava, “DETERMINING EFFICIENCY OF TOURISM SECTOR IN CERTAIN EUROPEAN COUNTRIES AND REGIONS BY APPLYING DEA ANALYSIS ”, Jour Proc Manag New Tech, vol. 9, no. 3-4, pp. 49–61, Oct. 2021, doi: 10.5937/jpmnt9-34122.