Посилання:Classification of the local isometry groups of rooted tree boundaries / Y. Lavrenyuk // Algebra and Discrete Mathematics. — 2007. — Vol. 6, № 2. — С. 104–110. — Бібліогр.: 6 назв. — англ.
Підтримка:Dedicated to V.I. Sushchansky on the occasion of his 60th birthday