Bijaksana, S., I. Rusyanti, M. I. T. Taib, L. A. Pasasa, and A. S. Andreas. 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.