Bi, Jian-Hong, Wen-Bo Tao, Zi-Xiang Huang, and Wen-Tao Bi. 2010. “Synthesis and Crystal Structure of a Tetraazamacrocyclic Copper(II) Complex”. Asian Journal of Chemistry 20 (8):6618-20. https://asianpubs.org/index.php/ajchem/article/view/13022.