“Frequency Hopped-Orthogonal Frequency Division Multiple Access (FH-OFDMA) System Performance With Extending Quadratic Congruence (EQC) Hoping Code Patterns”. Journal of Engineering and Sustainable Development, vol. 12, no. 1, Mar. 2008, pp. 96-106, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1639.