Shivkanya. D. Jadhav, and V. M. Harnal. “User Assignment Algorithm for Energy Efficient Multiple Access Scheme of MIMO-OFDMA Systems”. International Journal of Computer Engineering in Research Trends, vol. 4, no. 11, Nov. 2017, pp. 469-77, https://www.ijcert.org/index.php/ijcert/article/view/739.