Effets of Cobalt Oxide-Iron Oxide Ratios on the Catalytic Activity of Cobalt Ferrite Spinel Catalysts A.A. Said, K.M. Abd El-Salaam, E.A. Hassan, A.M. El-Awad et M.M.M. Abd El-Wahab J. Phys. IV France, 07 C1 (1997) C1-687-C1-688 DOI: 10.1051/jp4:19971282