Saswati Phookan, “Synthesis and characterization of polyamideimides from diaminobenzophenone-3,3′ ,4,4′ -tetracarboxylic diimides and aromatic dicarboxylic acid— terephthalic acid (TPA)”, ijetst, vol. 3, no. 06, pp. 4171-4175, Jun. 2016.