C. Lihua, H. Peizhi, D. Xiaolan, Z. Bo, and Z. Xiaocong, “Synthesis and Characterization of Open-ring Complexes Formed in the Reaction of Lanthanides(III) with Salicylaldehyde Schiff base Containing Pyridine and Amide Bridge”, ajc, vol. 17, no. 2, pp. 969–974, Jan. 2016.