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• Bergmann, F. et al., J.C.S., 1961, 4468, (synth)
• Taylor, E.C. et al., J.A.C.S., 1964, 86, 4721, (derivs)
• Traube, W. et al., Ber., 1906, 39, 227, (derivs)
• Goldner, H. et al., Annalen, 1966, 691, 142, (derivs)