Aromaticity of the doubly charged [8]circulenes / G. V. Baryshnikov, R. R. Valiev, N. N. Karaush [et.al.] // Physical chemistry chemical physics. 2016. Vol. 18, № 13. P. 8980-8992. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000575403