1. Topological Groups and Related Structures;Arhangelskii,2008
2. Uniform universal covers of uniform spaces;Berestovskii;Topology Appl.,2007
3. The universal cover of the quotient of a locally defined group;Berestovskii;Topology Proc.,2004
4. Geometric groups. I;Berestovskii;Trans. Amer. Math. Soc.,1999
5. Partitioning a set;Bing;Bull. Amer. Math. Soc.,1949