Kumar, Abhishek, et al. “Synthesis and Characterization of [(PbX2)2.L1] and [(PbX2)2.(MCl2).L1] Compounds With Macrocyclic Ligand”. Asian Journal of Chemistry, vol. 30, no. 11, Sept. 2018, pp. 2415-20, doi:10.14233/ajchem.2018.21404.