V. R.  Choudhary and Jana, P., ?Direct oxidation of H-2 to H2O2 over PdO/Al2O3 catalysts in aqueous acidic medium: influence on H2O2 formation of Pd loading, calcination temperature and reduction of catalyst and presence of halide anions?, Catalysis Communications, vol. 9, no. 14, pp. 2371-2375, 2008.