1. German Patent 293787 1913 (BASF)
2. Roelen O (1948) Angew Chem 60:62
3. Likholobov VA, Moroz BL (1997) In: Ertl G, Knözinger H, Weitkamp J (eds) Handbook of heterogeneous catalysis, vol IV. Wiley-VCH Verlag, Weinheim, Germany, p 2232
4. Buess P, Caers RFI, Frennet A, Ghenne E, Hubert C, Kruse N (2002) US Patent 6 362 239 B1
5. Liang DB, Abend G, Block JH, Kruse N (1983) Surf Sci 126:392