M. Ekpenyong, D. Asuquo, S. Robinson, I. Umoren, and E. Isong "Soft Handoff Evaluation and Efficient Access Network Selection in Next Generation Cellular Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 1616–1625, 2017, doi: 10.25046/aj0203201.