1. (a) G. Schiller (Chem. Verwertungsges. Oberhausen) German Patent 965,605, 1956; Chem. Abstr. 53 (1959) 11226.
2. (b) V.L. Hughes (Esso Res. Eng. Co), U.S. Patent 2,880,241, 1959; Chem. Abstr. 53 (1959) 14938.
3. (c) V.L. Hughes (Esso Res. Eng. Co), British Patent 801,734, 1958; Chem. Abstr. 53 (1959) 7014.
4. (a) L. Marko, in: R. Ugo (Ed.), Aspects of Homogeneous Catalysis, vol. II, Reidel, Dordrecht, 1974.
5. (b) P. Pino, F. Placenti, M. Bianchi, in: I. Wender, P. Pino (Eds.), Organic Syntheses via Metal Carbonyls, vol. II, Wiley, New York, 1977.