K. Singh, Ashok, et al. “Synthesis, Characterization and Antimycobacterial Activity of Phenanthrenequinone Thiosemicarbazones and Their Ruthenium and Zinc Complexes”. Asian Journal of Chemistry, vol. 33, no. 5, Apr. 2021, pp. 983-8, doi:10.14233/ajchem.2021.23127.