X. Yi, Q. Rong, N. Xu, Y. Wang, and X. Wang, “Novel Ni(II) coordination compounds containing phenanthroline derivatives and 3-carboxy-1-carboxymethyl-2-oxidopyridinium: synthesis, structure, and hirshfeld analysis”, Bull. Chem. Soc. Eth., vol. 41, no. 1, pp. 207–218, Nov. 2026.