YU, Y., L. DENG, M. CAI, Z. ZHOU, and T. WANG. “Synthesis and Characterization of Novel Soluble Aromatic Polyesters With Pendant Cyano Groups”. International Journal of Natural and Engineering Sciences, vol. 2, no. 3, July 2019, pp. 75-78, https://ijnes.org/index.php/ijnes/article/view/429.