1. 1) W. F. Libby, Science, 171, 499–500 (1971).
2. 2) F. Severino, J. L. Brito, J. Laine, J. L. G. Fierro and A. L. Agudo, J. Catal., 177, 82–95 (1998).
3. 3) F. S. Stone, “Chemisorption and Catalysis on Metallic Oxides”, Vol. 13, Advances in Catalysis (1962) pp. 1–53.
4. 4) M. Shelef, K. Otto and H. Gandhi, J. Catal., 12, 361–375 (1968).
5. 5) Y. F. Yu Yao, J. Catal., 39, 104–114 (1975).