Singh, Pratibha, et al. “Synthesis, Characterization and Antifungal Activity of Mn(II), Co(II), Ni(II) and Cu(II) Complexes With 4-Hydroxybenzaldehyde-N-4’-Cytidinylazomethine”. Asian Journal of Chemistry, vol. 23, no. 4, Dec. 2010, pp. 1723-7, https://asianpubs.org/index.php/ajchem/article/view/10230.