1. Altun, Didem (2006) ‘Turk Telecommunication Inc. Provincal Telecom Directorate's Efficiency Measurement by means of Data Envelopment Analysis’ Postgraduate Thesis, Gazi University, Instutute of Science.
2. Azofra, Valentin., Begona, Prieto and Alicia Santidran (2003). ‘The Usefulness Of A Performance Measurement System In A Daily Life Of An Organization: A Note A Case Study’, The British Accounting Review, V:35, I: 4, 123-145.
3. Boussofiane A.; Dyson R. and Rhodes E. (1991), ‘Applied Data Envelopment Analysis’, European Journal Of Operational Research, 1991, Vol.2, No.6: 1-15.
4. ‘Price Cap Regulation, Incentives And Quality: The Case Of Brazillian Telecommunications’, International Journal Of Production Economics;Façanha;V:,2004
5. ‘A note on the Malmquist productivity index’.Economics Letters;Grifell-Tatje;V:,1995