GOO, S.; LEONG, L. K.; HONG, Y. Y.; KUEN-SONG, L.; CHAO-LUNG, C. Direct ultrasound synthesis of vanadyl pyrophosphate catalyst for partial oxidation of n-butane to maleic anhydride. Science Proceedings Series, v. 1, n. 3, p. 5-7, 18 May 2019.