Velychko, T.V. “On the Structure of Some Non-Periodic Groups Whose Subgroups of Infinite Special Rank Are Transitively Normal”. Carpathian Mathematical Publications 13, no. 2 (November 2, 2021): 515–521. Accessed June 13, 2024. https://scijournals.pnu.edu.ua/index.php/cmp/article/view/4690.