Lavrenyuk YV, Sushchanskii VI. Lattice of normal subgroups of a group of local isometries of the boundary of a spherically homogeneous tree. Ukr. Mat. Zhurn. [Internet]. 2008Oct.25 [cited 2024Nov.23];60(10):1350–1356. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3249