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Lappert, M.F.; McCabe, R.W.; MacQuitty, J.J.; Pye, P.L.; Riley, P.I., Paramagnetic carbene-metal complexes. Part 1. Cationic chromium(I) complexes and the chemistry of their chromium(O) precursors and of related molybdenum(O) and tungsten(O) complexes, especially with bulky carbene ligands C(OR')R[R=CH(SiMe3)2 or CH2SiMe3], J. Chem. Soc. Dalton Trans., 1980, 90. [all data]