Radivojevic, V., B. Krstić, and J. Stanojević. “PERFORMANCE ASSESSMENT OF THE BALKAN COUNTRIES IN THE INFORMATION AND COMMUNICATION TECHNOLOGIES SECTOR”. Annals of Spiru Haret University. Economic Series, vol. 21, no. 2, July 2021, p. 247, https://www.anale.spiruharet.ro/economics/article/view/1060.