Engelking, Ryszard (1995). 《Theory of dimensions finite and infinite》. Sigma Series in Pure Mathematics (영어) 10. Heldermann Verlag: Lemgo. ISBN3-88538-010-2. MR1363947. Zbl0872.54002.
Engelking, Ryszard (1995). 《Theory of dimensions finite and infinite》. Sigma Series in Pure Mathematics (영어) 10. Heldermann Verlag: Lemgo. ISBN3-88538-010-2. MR1363947. Zbl0872.54002.