Banaei, Alireza, et al. “Synthesis and Electrochemical Properties of New Derivatives of Dibenzo(perhydrotriazino)-Aza-Crown Ethers and Their Cobalt(II) Complexes”. Asian Journal of Chemistry, vol. 29, no. 8, June 2017, pp. 1655-9, doi:10.14233/ajchem.2017.20488.