Taufiq-Yap, Y.H., A. Raslan, and R. Irmawati. “The Effect of Using H4P2O7 As Phosphorus Source for Synthesizing Vanadyl Pyrophosphate Catalysts”. Eurasian Chemico-Technological Journal 6, no. 3 (September 20, 2004): 207–212. Accessed September 18, 2024. https://ect-journal.kz/index.php/ectj/article/view/599.