Maulana, Lucky Zaehir, et al. “A Novel Synthesis Route and Functional Group Analysis by FTIR Spectroscopy of Graphene Oxide from Indigenous Coal and Graphite”. Proceedings Academic Universitas Jambi, vol. 2, no. 2, July 2026, pp. 247-53, https://doi.org/10.22437/proca.v2i2.55564.