1. A. M. EL-AWAD, E. A. HASSAN, A. A. SAID and K. M. ABD EL-SALAAM,Monatshefte Chem. 120 (1989) 199.
2. V. VAN TRUONG, P. TITTARELLI and P. L. VILLA, in Proceedings of the IIIrd International Conference on Chemical Uses of Molybdenum, edited by H. F. Barry and P. C. H. Mitchell (Climax Molybdenum Co., Ann Arbor, 1979) p. 161.
3. R. MALI?SKI, J. GALLUS-OLENDER and T. KUBICKA,React. Kinet. Catal. Lett. 10 (1979) 219.
4. G. ALESSANDRINI, L. CAIRATI, P. FORZATTI, P. VILLA and F. TRIFIRO,J. Less-Common Metals 54 (1977) 373.
5. YA. A. DORFMAN, in ?Katalizatory i mekhanizmy gidrirovaniya i okisleniya? (Nauka, Alma-Ata, 1984) pp. 287, 326.