A. Wang, W. Li, F. Guo, and X. Zhang, “Hydrothermal Synthesis and Crystal Structure of A One-dimensional Zigzag Chain Based on 2,4’-Biphenyl-dicarboxylic Acid and 4,4’-Bipyridine”, ajc, vol. 22, no. 9, pp. 7426–7428, Jul. 2010.