Vimala, B., et al. “Template Synthesis and Characterization of Transition Metal Complexes of 13, 15 and 17-Membered Tetraamide Macrocyclic Disubstituted Dimethyl Tetrasubstituted Tetraazacycloalka Tetrasubstituted Tetraene Disubstiuted Diol”. Asian Journal of Chemistry, vol. 32, no. 3, Jan. 2020, pp. 488-94, doi:10.14233/ajchem.2020.22362.