Characterization of Chernikov groups in the class of Shunkov groups with Sylow four-subgroups. Ivko, M.N. (2006) Sibirskie Ehlektronnye Matematicheskie Izvestiya [electronic only]
Connected transversals to subnormal subgroups Tomáš Kepka, Jon D. Phillips (1997) Commentationes Mathematicae Universitatis Carolinae Subnormal subgroups possessing connected transversals are briefly discussed.