“OPTIMUM DIMENSIONING OF INTERCONNECTIONS BETWEEN SOME GSM OPERATORS IN NIGERIA USING ERLANG B MODEL”. FUDMA JOURNAL OF SCIENCES 5, no. 4 (February 17, 2022): 285–290. Accessed September 12, 2025. http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/831.