A.R. Yari and M.R. Sadri, Effects of the Second Entrant in GSM Telecommunication Market in MENA Region. journal = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2008, vol. 24(12). 1294 - 1296 [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/7181.