Dong, M.-Q. et al. 2012. Synthesis, Characterization and Crystal Structure of a Supramolecular Compound Diaquabis(1,10-phenanthroline-k2N,N’)cobalt(II) 4,4’-Methylenebis(3-hydroxy-2-naphthoate) Tetrahydrate. Asian Journal of Chemistry. 25, 2 (Sep. 2012), 1003–1005. DOI:https://doi.org/10.14233/ajchem.2013.13351.