Bakhtin , O.K., Vyhivska , L.V. and Denega , I.V. (2020) “Extremal decomposition problem for the complex plane with free poles on the circle”, Ukrains’kyi Matematychnyi Zhurnal, 72(12), pp. 1599–1620. doi:10.37863/umzh.v72i12.6216.