[1]
Y. Gyun Lee, S. Tae Kim, D. Il Jung, and J. Tai Hanh, “Synthesis and Acid Catalytic Activity of 1,5,3,7-Diazadiphosphocine-1,5-dicarboxylic Acids”, ajc, vol. 27, no. 4, pp. 1481–1483, Feb. 2015.