Othman, Fatin Zulaikha, and Sallehuddin Shah Ayop. “Evaluation of Corrosion in Reinforced Concrete: A Review on the Application of UPV Method”. Recent Trends in Civil Engineering and Built Environment, vol. 2, no. 1, May 2021, pp. 160-7, https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/1423.