Ibrahim, H. K., S. H. El-Tamany, R. F. El-Shaarawy, and I. M. El-Deen. “Synthesis and Investigation of Mass Spectra of Some Novel Benzimidazole Derivatives”. Macedonian Journal of Chemistry and Chemical Engineering, vol. 27, no. 1, June 2008, pp. 65–79, doi:10.20450/mjcce.2008.248.