Shabbir, A., H. R. Khan, S. A. Ali, and S. Rizvi. “Design and Performance Analysis of Multi-Tier Heterogeneous Network through Coverage, Throughput and Energy Efficiency”. Engineering, Technology & Applied Science Research 7, no. 6 (December 18, 2017): 2345–2350. Accessed July 18, 2024. https://etasr.com/index.php/ETASR/article/view/1256.