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Khan, S., Nami, S. A. A., Siddiqi, K. S., Husain, E., & Naseem, I. (2009). Synthesis and characterization of transition metal 2,6-pyridinedicarboxylic acid derivatives, interactions of Cu(II) and Ni(II) complexes with DNA in vitro. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 72(2), 421–428. doi:10.1016/j.saa.2008.10.001 
10.1016/j.saa.2008.10.001