Rao, D. S., and V. B. Hency. “QoS Based Radio Resource Management Techniques for Next Generation MU-MIMO WLANs: A Survey”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 8, no. 1, Apr. 2016, pp. 97-105, https://jtec.utem.edu.my/jtec/article/view/696.