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2. On some properties of radial spaces;Arhangel'skiǐ;Mat. Zametki,1980
3. Classes of topological groups;Arhangel'skiǐ;Russian Math. Surveys,1981
4. Algebraic objects generated by topological structures;Arhangel'skiǐ;Itogi Nauki i Techniki, VINITI Ser. Algebra, Topology, Geometry,1987
5. General Topology;Engelking,1977