Kudratov, Kh., and Ya. Khusanbaev. “Some Limit Theorems for the Critical Galton–Watson Branching Processes”. Ukrains’kyi Matematychnyi Zhurnal, vol. 75, no. 4, May 2023, pp. 467-7, https://doi.org/10.37863/umzh.v75i4.6781.