A. Lincoln, S. Boinapalli, and A. A. Kumar, “Synthesis, Spectral Characterization and Antibacterial Investigation of Ni(II) Coordination Complexes of Macrocyclic Schiff base ligands Derived from 4-Aminoantipyrine”, JAC, vol. 13, no. 1, pp. 5948–5958, May 2017.