Ali, Roushown, et al. “Synthesis of Cationic Pd(II) Complexes With 5-Membered Ring Chelating Iminoylcarbene Ligand and Its Catalytic Activity on Norbornene Polymerization”. Asian Journal of Chemistry, vol. 31, no. 3, Jan. 2019, pp. 637-41, doi:10.14233/ajchem.2019.21645.