C. Feng Ding, M. Zhu, X.-M. Li, S. Sheng Zhang, H. Xu, and P.-K. Ouyang, “Synthesis and Crystal Structure of Tetra[pyridine]diperchlorato-K2 O-Cadmium(II)”, ajc, vol. 18, no. 3, pp. 1685–1689, Mar. 2010.