1. Semi-developable spaces and quotient images of metric spaces;Alexander;Pacific J. Math.,1971
2. On the metrization of topological spaces;Alexandroff;Bull. Acad. Polon. Sci., Ser. Math., Astr., Phys.,1960
3. P. S. Alexandroff, On some results concerning topological spaces and their continuous mappings, Proc. Prague Symposium (1962), 41–54.
4. Open and near open mappings;Arhangel'skii;Connections between spaces, Trans. Moscow Math. Soc.,1966
5. Open and almost open mappings of topological spaces;Arhangel'skii;Soviet Math. Dokl.,1962