A. Fatoni, P. L. Hariani, H. Hermansyah, and A. Lesbani, “A Adsorbent of Chitosan Linked by Methylene Bridge and Schiff Base of 4,4-diaminodiphenyl Ether –vanillin : Synthesis, Characterization and Its Application After Reacted by Zn(II) Ion as Antibacterial Agent”, sci. technol. indones., vol. 3, no. 4, pp. 173–177, Oct. 2018.