1. Every metric compactification is a Wallman-type compactification;Aarta,1968
2. On Wallman's method of compactification;Banachschewaki;Math. Nachr.,1963
3. Kompaktisierungen und Bikompaktisierungen;Freudenthal;Indag. Math.,1951
4. Compactifications and semi-normal spaces;Frink;Amer. J. Math.,1964
5. A note on Wallman compactifications;van Mill;Nw. Arch. Wisk.,1976