Let G be a locally nilpotent p-group in which every proper subgroup is an NC-group. It is shown that G is itself an NC-group if either (i) the normal closure of every finite subgroup of G is a Chernikov extension of a CC-group or (ii) every proper normal subgroup of G is the union of an ascending chain of normal CCsubgroups.
ASAR, A.O. and YALINCAKLIOĞLU, A. (1997) "Locally Nilpotent P-Groups Whose Proper Subgroups are NC-Groups," Turkish Journal of Mathematics: Vol. 21: No. 4, Article 13. Available at: https://journals.tubitak.gov.tr/math/vol21/iss4/13