Taufiq-Yap, Y., Raslan, A. and Irmawati, R. (2004) “The Effect of Using H4P2O7 as Phosphorus Source for Synthesizing Vanadyl Pyrophosphate Catalysts”, Eurasian Chemico-Technological Journal, 6(3), pp. 207–212. doi: 10.18321/ectj613.