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Daamen, H.; Oskam, A.; Stufkens, D.J.; Waaijers, H.W., Bonding properties of group VIB metal pentacarbonyl azole complexes studied by electronic absorption, photoelectron, 13C NMR and vibrational spectroscopy, Inorg. Chim. Acta, 1979, 34, 253. [all data]