1. 4-amino-o-phthalic acid and some of its derivatives;Bogert;J. Am. Chem. Soc.,1908
2. W.M. Edwards, I.M. Robinson, 1955 US Patent 2710853.
3. Polyimides: Fundamentals and Applications; Plastics Engineering Series 36;Ghosh,1996
4. Polyimides and Other High Temperature Polymers;Abadie,1991
5. Polyimides: Chemistry and Characterization;Feger,1994