Yah, N. F. N., H. A. Rahim, Y. S. Lee, F. H. Wee, and H. H. Zainal. “Electromagnetic Wave Absorption Properties of Novel Green Composites Coconut Fiber Coir and Charcoal Powder over X-Band Frequency for Electromagnetic Wave Absorbing Applications”. Advanced Electromagnetics, vol. 7, no. 1, Jan. 2018, pp. 13-18, doi:10.7716/aem.v7i1.598.