V. Lokesh Raju, V. Rajya Lakshmi, and M. S Anuradha, “Notch Band Switchable Reconfigurable Monopole Antenna with Defected Ground Structure for Wideband Applications”, IJET, vol. 7, no. 3.27, pp. 613–616, Aug. 2018, doi: 10.14419/ijet.v7i3.27.18506.