Zabolotskyy, M. V., and T. M. Zabolotskyy. “On a Property of the Nevanlinna Characteristic”. Ukrains’kyi Matematychnyi Zhurnal, vol. 73, no. 8, Aug. 2021, pp. 1140-6, https://doi.org/10.37863/umzh.v73i8.6627.