B. Kaur, A. Marwaha, and S. Rani. “Characterization of 4 Element Compact Microstrip Patch Antenna Array for Efficient Null Steering”. Applied Computational Electromagnetics Society Journal (ACES), vol. 32, no. 12, July 2021, pp. 1105-13, https://journals.riverpublishers.com/index.php/ACES/article/view/9387.