Islam, M Saidul, Motahera Begum, Harendra Nath Roy, and Yeamin Reza. 1998. “?STUDIES ON MIXED LIGAND COMPLEXES OF IRON (III), CHROMIUM (III) AND NICKEL (II) CONTAINING DICARBOXYLIC ACID AND 5, 7, 7, 12, 14, 14 HEXAMETHYL 1, 4, 8, 11 TETRAAZACYCLOTETRADECA 4, 11 DIENE”. Biological Sciences - PJSIR 41 (5):221-24. https://v2.pjsir.org/index.php/biological-sciences/article/view/2275.