S. M. Omran, E. T. Abdullah, and O. A. Al-Zuhairi, “Structural and Infrared Spectroscopy of Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes Nanocomposite”, IJP, vol. 19, no. 51, pp. 1–6, Dec. 2021, doi: 10.30723/ijp.v19i51.691.