Chi Ma, Hongsheng Zhai, Yonggang Yang & Yufang Liu. (1970). A DFT/TDDFT Investigation on Intramolecular Proton Transfer of Bis(imino)isoindole.
            <i>Communications in Computational Chemistry</i>. <i>3</i> (2).
            55-65.
         doi:10.4208/cicc.2015.v3.n2.3