Bijaksana, S., Rusyanti, I., T. Taib, M. I., Pasasa, L. A., & Andreas, A. S. (2014). The Use of GPR in Delineating an Iron Sand Boundary and the Determination of Its Electromagnetic Wave Velocity: A Case Study in Jepara, Central Java. Journal of Engineering and Technological Sciences, 37(2), 77-90. https://doi.org/10.5614/itbj.eng.sci.2005.37.2.1