1. Ball Structures and Colorings of Graphs and Groups;Banakh,2003
2. A universal uniform rational ultrametric on the space irrational numbers;Bogatyĭ;Vestnik Moskov. Univ. Ser. I Mat. Mekh.,2000
3. Metrically homogeneous spaces;Bogatyĭ;Uspekhi Mat. Nauk,2002