1. Olah GA (2005) Angew Chem Int Ed 44:2636
2. Hansen JB, Højlund Nielsen PE (2008) In: Ertl G, Knözinger H, Schüth F, Weitkamp J (eds) Handbook of heterogeneous catalysis, vol 6. Wiley, Weinheim, p 2920
3. Christiansen JA (1919) US Patent 1,302,011, 29 April 1919)
4. Turek T, Trimm DL (1994) Catal Rev Sci Eng 36:645
5. Sapienza RS, Slegeir WA, O’Hare TE, Mahajan D (1986) US Patent 4,614,749, 30 Sept 1986