D. I. Giokas

Evaluating productive efficiency in telecommunications: evidence from Greece

G. C. Pentzaropoulos, D. Giokas, D. I. Giokas, 2000 .

Comparing the operational efficiency of the main European telecommunications organizations: A quantitative analysis

G. C. Pentzaropoulos, D. Giokas, D. I. Giokas, 2002 .