1. S. Gao, V. Kieftenbeld, Resolvable maps preserve complete metrizability, preprint
2. Gδ-embeddings in Hilbert space;Ghoussoub;J. Funct. Anal.,1985
3. Relativ perfekte Teile von Punktmengen und Mengen (A);Hurewicz;Fund. Math.,1928
4. Topology I;Kuratowski,1968
5. New basic result in classical descriptive set theory: Preservation of completeness;Ostrovsky;Topology Appl.,2009