Gyun Lee, Yong, Sung Tae Kim, Dai Il Jung, and Jung Tai Hanh. “Synthesis and Acid Catalytic Activity of 1,5,3,7-Diazadiphosphocine-1,5-Dicarboxylic Acids”. Asian Journal of Chemistry 27, no. 4 (February 4, 2015): 1481–1483. Accessed November 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/27_4_68.