Javier Otal, Nikolaj N. Semko, Nikolaj N. Semko, “On groups whose transitively normal subgroups are either normal or self-normalizing”, Annali di Matematica, 192:5 (2013), 901
Fomin A.A., “Abelian groups in Russia”, Rocky Mountain Journal of Mathematics, 32:4 (2002), 1161–1180