Angraini, S., G. Gusnedi, R. Jonuarti, and F. U. Jhora. “Effect of The Camposition Nanocomposite Fe3O4-Graphene Oxide on Optical Properties Synthesized from Coconut Shell Charcoal”. Journal of Experimental and Applied Physics, vol. 2, no. 2, June 2024, doi:10.24036/jeap.v2i2.60.