F. F. Bamoharram, M. M. Heravi, and R. Omidinia, “Supported Nano-SiO2 H14[NaP5W30O110] Heteropolyacid: A Green and Reusable Catalyst in Oxidation of Aromatic Aldehydes”, ajc, vol. 24, no. 12, pp. 5582–5584, Aug. 2012.