Synthesis and Reactivity of Some Peroxo Complexes of Zirconium(IV) Thorium(IV) and Uranium(VI) Ions Containing a Quadridentate, Quadrinegative Ligand and a Pentadentate Dinegative Schiff Base: Peroxo Complexes of Zr, Th and U. Pakistan Journal of Scientific & Industrial Research 2010, 53 (2), 63-67.