Yannis G. Smirlis Dimitris K. Despotis J. Jablonsky P. Fiala Identifying "Best-Buys" In The Market Of Prepaid Mobile Telephony: An Application Of Imprecise Dea. 167-177 2004 3 International Journal of Information Technology and Decision Making 1 http://dx.doi.org/10.1142/S0219622004000970 db/journals/ijitdm/ijitdm3.html#SmirlisDJF04