DONG, HUA-ZE, et al. “Synthesis and Crystal Structure of Di(thiocyanato-κN)bis(1,10-Phenanthroline-5,6-Dione-κ2N,N&Acute;)- Manganese(II): [(C12H6N2O2)2Mn(NCS)2]2”. Asian Journal of Chemistry, vol. 22, no. 6, May 2010, pp. 4950-2, https://asianpubs.org/index.php/ajchem/article/view/16798.