W. Xu, L. Liu, S. Wang, and Y. Hu, “Study on Fluorine-Containing Polyurethane Elastomers Based on 2,2-Bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]hexafluoropropane”, ajc, vol. 26, no. 5, pp. 1324–1326, Mar. 2014.