Eder Fabian Ruiz, Daniel Chaparro-Arce, John J. Pantoja, Felix Vega, Chaouki Kasmiv, and Fahad Al Yafei. “Ground Penetrating Radar Radargram Filter Using Singularity Expansion Method”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 35, no. 11, Nov. 2020, pp. 1437-8, https://journals.riverpublishers.com/index.php/ACES/article/view/7639.