Niemiec P. The electronic structure of phosphotungstic (H₃PW₁₂O₄₀) heteropolyacids modified by Fe²⁺ cation. Sci, Tech. Innov. [Internet]. 2021 Feb. 2 [cited 2024 Nov. 21];11(4):24-32. Available from: https://journals.anstar.edu.pl/index.php/sti/article/view/295