VelesnitskiiV. F., and SemenchukV. N. “On Finite Groups With Permutable Generalized Subnormal Subgroups”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 65, no. 11, Nov. 2013, pp. 1555–1559, https://umj.imath.kiev.ua/index.php/umj/article/view/2534.