WASET
    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.