Kumar, D., Syamal, A., Pandey, V., & Rani, M. (2011). Studies on Polystyrene-Anchored Coordination Compounds of Divalent, Trivalent, Tetravalent and Hexavalent Metal Ions with the Schiff Base Obtained from the Condensation of 3-Formylsalicylic Acid and o-Hydroxyphenylurea. Asian Journal of Chemistry, 23(11), 5004–5008. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/11030