“Peculiarities of Complexes Based on Dibenzo[b, I]-1,4,8,11-Tetraaza[14]annulene. The Crystal and Molecular Structure of Nickel(II) Complex 5,7,12,14-Tetramethyl-6,13-Dibenzoyldibenzo[b,i]-1,4,8,11-Tetraaza[14]annulene”. V. N. Karazin Kharkiv National University Bulletin. Chemical Series, no. 24, Oct. 2014, pp. 75-81, https://doi.org/10.26565/2220-637X-2014-24-08.