1. On certain subsets of a group, Questions Answers Gen.;Bella;Topology,1999
2. On certain subsets of a group. II, Questions Answers Gen.;Bella;Topology,2001
3. Groups with a small set of generators
4. Every infinite group can be generated by P-small subset
5. Topological groups similar to Lindel¨of groups;Guran;Dokl Akad Nauk SSSR,1981