Kuzennyi, N. F., and S. V. Maznichenko. “Structure of Certain Classes of Groups With Locally Cyclic Abelian Subgroups”. Ukrains’kyi Matematychnyi Zhurnal, vol. 51, no. 12, Dec. 1999, pp. 1614–1627, https://umj.imath.kiev.ua/index.php/umj/article/view/4766.