Petropoulos , Celestine. “Recent Advances in Optimized Sparse Spatial Self-Nested Graph Neural Networks for Secure MU-MIMO-OFDM Systems: Channel Estimation, Attack Detection and Mitigation – A Systematic Review”. International Journal of Electrical, Electronics and Computer Systems, vol. 12, no. 1, Feb. 2023, pp. 71-79, doi:10.65521/ijeecs.v12i1.2633.