Y. Nakayama, K. Unoura, Y. Igarashi, M. J. Hossain, and H. Sakiyama, “Synthesis and electrochemistry of dimanganese(II) complexes of phenol-based dinucleating ligands with four methoxyethyl chelating arms”, Eur. J. Chem., vol. 2, no. 2, pp. 266–268, Jun. 2011.