1. M. Boudart, Principles of Heterogeneous Catalysis, in:Handbook of Heterogeneous Catalysis, G. Ertl, H. Kn�zinger and J. Weitkamp (eds.) (VCH, Weinheim, 1997) (p. 1); G.A. Somorjai, Introduction to Surface Chemistry and Catalysis (John Wiley & Sons, New York, 1994); G. Ertl, in:Catalytic Ammonia Synthesis, J.R. Jennings (ed.) (Plenum, New York, 1991) p. 109; R. Hoffmann, Solids and Surfaces: A Chemist?s View of Bonding in Extended Structures (VCH, New York, 1988)
2. M.A. Barteau, Catal. Lett. 8 (1991) 175; T. Bligaard, J.K. N�rskov, S. Dahl, J Matthiesen, C.H. Christensen and J.S. Sehested, J. Catal. 224 (2004) 206
3. The Brønsted–Evans–Polanyi Relation and the Volcano Plot for Ammonia Synthesis over Transition Metal Catalysts
4. B.I. Lundqvist, O. Gunnarsson, H. Hjelmberg and J.K. N�rskov, Surf. Sci. 89 (1979) 196; B. Hammer and J.K. N�rskov, Nature 376 (1995) 238