Kumar, R.; Johar, R.; Aggarwal, A. K. Synthesis, Structural Elucidation and Antimicrobial Effectiveness of Coordination Entities of Cobalt (II) and Nickel (II) Derived from 9,17-Diaza-2,6,11,15-Tetrathia-1,7,10,16-(1,2)-Tetrabenzenacyclooctadecaphan-8,17-Diene. Eur. J. Chem. 2012, 3, 57-64.