1. U. Gerloff, J. Jahn and A. Schleicher, Br. Pat. 1067083, 3 May 1967.
2. H. Friedrich and W. Neugebauer, Ger. Pat. 2145851, 22 March 1973, US Pat. 3843562, 22 October 1974.
3. Proc. of the Climax 4th Int. Conf. on the Chemistry and Uses of Molybdenum;Cairati,1982
4. THE OXIDATION OF METHANOL WITH AIR OVER IRON, MOLYBDENUM, AND IRON-MOLYBDENUM OXIDES