E. Kapassa, M. Touloupou, P. Stavrianos, G. Xylouris, and D. Kyriazis "Managing and Optimizing Quality of Service in 5G Environments Across the Complete SLA Lifecycle", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 329–342, 2019, doi: 10.25046/aj040132.