Pasichnyk, M., E. Kucher, and L. Hyrlya. “Synthesis of Magnetite Nanoparticles Stabilized by Polyvinylpyrrolidone and Analysis of Their Absorption Bands”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 6 (93), May 2018, pp. 26-32, doi:10.15587/1729-4061.2018.132057.