Guo, Feng. “Hydrothermal Synthesis and Crystal Stucture of a Mn(II) Coordination Polymer Containing Pyridine-Carboxylic Ligand”. Asian Journal of Chemistry, vol. 21, no. 8, Mar. 2010, pp. 6604-6, https://asianpubs.org/index.php/ajchem/article/view/12370.