Aja , R.O., Agwu , E.U., Ezeh , S.I. and Stephen , U.J. 2019. Mathematical Optimization Model Technique for Network Congestion Control in Global System for Mobile Communications. Earthline Journal of Mathematical Sciences. 1, 1 (Jan. 2019), 51-61. DOI:https://doi.org/10.34198/ejms.1119.5161.