Nguyen, Anh Tien, et al. “SYNTHESIS AND INVESTIGATION OF THE OPTICAL AND ELECTRICAL PROPERTIES OF COBALT-DOPED HOLMIUM ORTHOFERRITE NANOPARTICLES”. Ho Chi Minh City University of Education Journal of Science, vol. 22, no. 5, May 2025, pp. 790-0, doi:10.54607/hcmue.js.22.5.4808(2025).