1. Iron: W. Hübel,in I. Wender and P. Pino (eds.),Organic Syntheses via Metal Carbonyls (J. Wiley, Interscience, New York, 1968), Vol. I, p. 273; Cobalt:
2. G. Palyi, G. Varadi, and L. Marko,in I. Bernal (ed.),Stereochemistry of Organometallic and Inorganic Compounds (Elsevier, Amsterdam, 1986), Vol. I, p. 358;
3. G. Süss-Fink and F. Neumann,in F. R. Hartley (ed.),The Chemistry of the Metal Carbon Bond (J. Wiley, New York, 1989). Vol. 5, Chap. 7, p. 231;
4. R. D. W. Kemmitt and D. Russel,in G. Wilkinson, F. G. A. Stone, and E. W. Abel (eds.),Comprehensive Organometallic Chemistry (Pergamon, Oxford, 1982), Vol. 5, p. 1.
5. H. Vahrenkamp (1983).Adv. Organomet. Chem. 22, 169.