Tien, Nguyen, Bui Xuan Vuong, & Nguyen Tuan Loi.
" Synthesis of HoFeO3 Nanomaterials by Citric Acid  Sol-gel Method." <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], 36.4 (2020): n. pag. Web. 20 Nov. 2024