Characterization by 51V solid state NMR of vanadium in dehydrated H4PVMo11O40 and Na1.5H2.5PVMo11O40 catalystsB Taouk, D Ghoussoub, A Bennani, E Crusson, M Rigole, A Aboukais, R Decressain, M Fournier and M GueltonJ. Chim. Phys., 89 (1992) 435-444DOI: https://doi.org/10.1051/jcp/1992890435