Yusof, N., D. Rana, A. F. Ismail, and T. Matsuura. “Microstructure of Polyacrylonitrile-Based Activated Carbon Fibers Preparedfrom Solvent-Free Coagulation Process”. Journal of Applied Research and Technology, vol. 14, no. 1, Feb. 2016, doi:10.1016/j.jart.2016.02.001.