Xi-Shi, Tai, and Li Fa-Hui. “Synthesis, Crystal Structure and Antitumor Activity of 1D Coordination Polymer of Ca(II) and Na(I) With N-P-Tolylsulfonyl-Glycine”. Asian Journal of Chemistry, vol. 25, no. 8, Mar. 2013, pp. 4401-3, doi:10.14233/ajchem.2013.13992.