Srivastava, Sadhna, Nihal Ahmad, and P.R. Shukla. 2010. “Co-Ordination Complexes of Tetradentate N2O2 Donor Macrocyclic Ligand (b,i) Dibenzo-M-(dinitrobenzo)5,8- Diaza, 1,12-Dioxocyclotetradeca 4,8-Diene With Cu(II), Ni(II), and Co(II) ”. Asian Journal of Chemistry 4 (1):184-87. https://asianpubs.org/index.php/ajchem/article/view/25023.