Joret, A., M. F. L. Abdullah, S. H. Dahlan, A. Madun, and M. S. Sulong. “Development of Ground Penetrating Radar Hybrid System Using Vivaldi Antenna for Buried Object Detection”. International Journal of Electrical Engineering and Applied Sciences (IJEEAS), vol. 1, no. 1, Apr. 2018, pp. 39-44, https://ijeeas.utem.edu.my/ijeeas/article/view/3903.