1. Polyimides;Sroog;J. Polym. Sci., Macromol. Rev,1976
2. Polyimides;Sroog;Prog. Polym. Sci.,1991
3. 4-Amino-o-phthalic acid and some of its derivatives;Bogert;J. Am. Chem. Soc.,1908
4. W.M. Edwards and I.M. Robinson (1955). Polyimides of pyromellitic acid. Copyright © 2017 American Chemical Society (ACS). All Rights Reserved.