1. J. Newham, Chem. Rev. 63 (1963) 123.
2. F.G. Gault, Adv. Catal. 30 (1981) 1.
3. Z. Pa�l, and P. T�t�nyi, in:Specialist Periodical Reports on Catalysis, Vol. 5 (The Royal Society of Chemistry, London, 1982) p. 80; Z. Pa�l, Adv. Catal. 29 (1980) 273.
4. M. Bart�k and �.G. Zsigmond, in:Stereochemistry of Heterogeneous Metal Catalysis (Wiley, Chichester, 1985) p. 17.
5. B. T�r�k, I. P�link�, �. Moln�r and M. Bart�k, J. Catal. 143 (1993) 111; M. Bartok, B. T�r�k, �. Moln�r and J. Apjok, React. Kinet. Catal. Lett. 49 (1993) 111.