1. P. Roisson, J.-P. Brunelle, P. Nortier, in: A.B. Stiles (Ed.), Catalyst Supports and Supported Catalysts, Butterworth, Boston, 1987, p. 11
2. A.B. Stiles (Ed.), Catalyst Supports and Supported Catalysts, Butterworths, Boston, 1987, p. 57
3. DEGUSSA AG, Precious Metal Cycle and Precious Metal Recovery