Shah, A.; Khuhawar, M.; Ali Shah, A. Preparation and Characterization of Poly Metal Complexes Derived from 5,5’-Methylenebis(2-Hydroxy Benzaldehyde) and 6,6’-Methylenebis(2-Hydroxy Naphthaldehyde) With Hydrazine and 4-Amino Phenyl Ether. ajc 2014, 26, 6055-6060.