H. J. Yue, D. Zhang, Y. Chen, Z. Shi, S. H. Feng, “An oxovanadium(IV) complex derived from L-histidine, [V2O2(L-his)2(2,2'-bipy)2]·[C2H6O2·(2,2'-bipy)]: Hydrothermal synthesis, crystal structure and magnetic properties”, 2006, Inorg. Chem. Comm., 2006, 9 (9), 959-961.