Goo, Silver, Loong Kong Leong, Yap Yeow Hong, Lin Kuen-Song, and Chiang Chao-Lung. 2019. “Direct Ultrasound Synthesis of Vanadyl Pyrophosphate Catalyst for Partial Oxidation of N-Butane to Maleic Anhydride”. Science Proceedings Series 1 (3), 5-7. https://doi.org/10.31580/sps.v1i3.861.