Z. Alwan, Ghasaq, et al. “Producing Hydrogen Energy Using Cr2O3-TNFs Nanocomposite With Animal (Chitosan) Extract via Ultrasonic and Hydrothermal Techniques”. Iraqi Journal of Physics, vol. 20, no. 3, Sept. 2022, pp. 1-12, https://doi.org/10.30723/ijp.v20i3.1001.