Gupta, S.P., and A. Garg. “ Electronic and Vibrational Spectral Studies OfPentafluoro-Benzoic Acid and Pentafluoro-Benzonitrile ”. Asian Journal of Chemistry, vol. 4, no. 4, Mar. 2010, pp. 852-64, https://asianpubs.org/index.php/ajchem/article/view/25162.