Perfect set property (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Perfect set property" in English language version.

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eudml.org (Global: low place; English: low place)

J. Väänänen, "A Cantor-Bendixson theorem for the space $\omega _{1}^{\omega _{1}}$ ". Fundamenta Mathematicae vol. 137, iss. 3, pp.187--199 (1991).