BaryshovetsP. P. “On Complementability of Nonmetacyclic Subgroups in Finite $A$-Groups”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 53, no. 12, Dec. 2001, pp. 1600-6, https://umj.imath.kiev.ua/index.php/umj/article/view/4381.