1. Some nonnormal subspaces of the Čech-Stone compactification of a discrete space;Blaszczyk;8th Winterschool on Abstract Analysis and Topology,1980
2. The integers and topology;van Douwen,1984
3. Projective covers of ordinal subspaces;Kunen;Topology Proc.,1978
4. Nonnormality of some subspaces of βX where X is a discrete space;Malyhin;Dokl. Akad. Nauk SSSR,1973
5. Martin's axiom and properties of topological spaces;Malyhin;Dokl. Akad. Nauk SSSR,1973