Wen-Tong, Chen, and Jiang Cheng. “Hydrothermal Synthesis and Crystal Structure of (4,4’-H2bipy)(ZnI4)”. Asian Journal of Chemistry, vol. 23, no. 10, Aug. 2011, pp. 4416-8, https://asianpubs.org/index.php/ajchem/article/view/10867.