Geodesic
On some soluble groups in which $U$-subgroups form a lattice
Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 4, pp. 585-593.

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The article is dedicated to groups in which the set of abnormal and normal subgroups ($U$-subgroups) forms a lattice. A complete description of these groups under the additional restriction that every counternormal subgroup is abnormal is obtained.
Classification : 20E07, 20E15, 20F16
Keywords: abnormal subgroups; $U$-subgroups; counternormal subgroups 
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     title = {On some soluble groups in which $U$-subgroups form a lattice},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
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Kurdachenko, Leonid A.; Subbotin, Igor Ya. On some soluble groups in which $U$-subgroups form a lattice. Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 4, pp. 585-593. http://geodesic.mathdoc.fr/item/CMUC_2007__48_4_a2/