Mirzataheri, M., M., (1999). 'The Synthesis of Polytetramethylene Ether Glycol with Specific Molecular Weight and Narrow Distribution by Cationic Ring Opening Polymerization of THF and Protonated Acids Application of Chitosan as an Adsorbent for Colour', Iranian Journal of Polymer Science and Technology, 12(4), pp. -. doi: 10.22063/jipst.1999.312