Kovalenko О.V., et al. “Optical, Structural and Radiospectroscopic Studies of ZnO MnO Nanostructures Synthesized by Ultrasonic Spray Pyrolysis”. Physics and Chemistry of Solid State, vol. 26, no. 2, June 2025, pp. 447-56, doi:10.15330/pcss.26.2.447-456.