1. (a) Frohning, C.D., Kohlpaintner, C.W. and Bohnen, H.-W.(2003) Carbon Monoxide and Synthesis Gas Chemistry, in Applied Homogeneous Catalysis with Organometallic Compounds, Cornils, B. and Herrmann, W.A. (eds.), Wiley-VCH, Weinheim, Vol. 1, pp. 31-103;
2. (b) van Leeuwen, P.W.N.M. (ed.) (2004) Homogeneous Catalysis, Kluwer Academic Press, Dordrecht.
3. In 2005, the price of cobalt (99.8%) quoted around 43 US$/Kg.Important variations were observed for rhodium. In 2004, itsmaximum value was established around 49000 US$/Kg with an average around 31783 US$/kg.
4. Herwig, J. and Fischer, R. (2000) in Rhodium Catalyzed Hydroformylation, van Leeuwen, P.W.N.M. and Claver, C. (eds.), Kluwer Academic Publishers, Dordrecht, p. 189.