DrozdY. A., and Plakosh А. І. “Chernikov 2-Groups With the Kleinian Top and Totally Reducible Bottoms”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 73, no. 7, July 2021, pp. 1005 -08, doi:10.37863/umzh.v73i7.6552.