Patel, S.V., et al. “Electric Conductivity of Cured Arylhydrazino-N,N’-(4,4’,1,1’-Sulfonyl Biphenylene) Bis-Maleimide-Epoxy Resins”. Asian Journal of Chemistry, vol. 16, no. 2, Sept. 2016, pp. 1143-8, https://asianpubs.org/index.php/ajchem/article/view/14570.