[1]
P. . Ralević, M. . Dobrodolac, L. . Švadlenka, D. . Šarac, and D. . Đurić, “Efficiency and productivity analysis of universal service obligation: a case of 29 designated operators in the European countries”, TEDE, vol. 26, no. 4, pp. 785–807, Jun. 2020, doi: 10.3846/tede.2020.12062.