1. Topologie I;Alexandroff,1935
2. Note on convergence in topology;Arens;Math. Mag.,1950
3. Some types of factor mappings and the relations between classes of topological spaces;Arhangel'skii;Dokl. Akad. Nauk SSSR,1963
4. The spectrum of frequences of topological spaces and their classification;Arhangel'skii;Dokl. Akad. Nauk SSSR,1972
5. The spectrum of frequences of a topological space and the product operation;Arhangel'skii;Trudy Moskov. Mat. Obšč.,1979