R. A. Mohammed and U. L. Bombale, “Cross-Configured Wideband Multiple-Input Multiple-Output Antenna with Defected Ground Structure and Parasitic Directors for 2.7–12 GHz Ultra-Wideband and Sub-6 GHz Wireless Applications”, Buletin Ilmiah Sarjana Teknik Elektro, vol. 8, no. 4, pp. 996–1018, Jul. 2026.