Kotsyubynsky, V.O., et al. “Structural Properties of Graphene Oxide Materials Synthesized Accordinglyto Hummers, Tour and Modified Methods: XRD and Raman Study”. Physics and Chemistry of Solid State, vol. 22, no. 1, Feb. 2021, pp. 31-38, doi:10.15330/pcss.22.1.31-38.