Zen, N. A., Permatasari, I., Hikmah, I., Yuliantoro, P. and Rahmawati, D. (2025) “UTILIZATION OF ULTRASONIC WAVE IN THE PRODUCTION OF REDUCED GRAPHENE OXIDE FROM COCONUT SHELL BIOMASS: ECO-FRIENDLY AND SUSTAINABLE APPROACH”, Indonesian Physical Review, 8(2), pp. 391–399. doi: 10.29303/ipr.v8i2.434.