Surface Behavior of Supported 12-Heteropoly Acid As Revealed by Nuclear Magnetic Resonance, X-ray Photoelectron Spectroscopy, and Fourier Transform Infrared Techniques
S. Damyanova, J. L. G. Fierro, I. Sobrados, and J. Sanz
Langmuir, 1999, 15 (2), pp 469–476
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http://dx.doi.org/10.1021/la981002o