Nielsen–Schreier theorem (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nielsen–Schreier theorem" in English language version.

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Läuchli (1962) Läuchli, Hans (1962), "Auswahlaxiom in der Algebra", Commentarii Mathematici Helvetici, 37: 1–18, doi:10.1007/bf02566957, hdl:20.500.11850/131689, MR 0143705, S2CID 186223589.
Howard (1985). Howard, Paul E. (1985), "Subgroups of a free group and the axiom of choice", The Journal of Symbolic Logic, 50 (2): 458–467, doi:10.2307/2274234, JSTOR 2274234, MR 0793126, S2CID 33535673.

doi.org

Läuchli (1962) Läuchli, Hans (1962), "Auswahlaxiom in der Algebra", Commentarii Mathematici Helvetici, 37: 1–18, doi:10.1007/bf02566957, hdl:20.500.11850/131689, MR 0143705, S2CID 186223589.
Howard (1985). Howard, Paul E. (1985), "Subgroups of a free group and the axiom of choice", The Journal of Symbolic Logic, 50 (2): 458–467, doi:10.2307/2274234, JSTOR 2274234, MR 0793126, S2CID 33535673.

handle.net

hdl.handle.net

Läuchli (1962) Läuchli, Hans (1962), "Auswahlaxiom in der Algebra", Commentarii Mathematici Helvetici, 37: 1–18, doi:10.1007/bf02566957, hdl:20.500.11850/131689, MR 0143705, S2CID 186223589.

jstor.org

Howard (1985). Howard, Paul E. (1985), "Subgroups of a free group and the axiom of choice", The Journal of Symbolic Logic, 50 (2): 458–467, doi:10.2307/2274234, JSTOR 2274234, MR 0793126, S2CID 33535673.

semanticscholar.org

api.semanticscholar.org

Läuchli (1962) Läuchli, Hans (1962), "Auswahlaxiom in der Algebra", Commentarii Mathematici Helvetici, 37: 1–18, doi:10.1007/bf02566957, hdl:20.500.11850/131689, MR 0143705, S2CID 186223589.
Howard (1985). Howard, Paul E. (1985), "Subgroups of a free group and the axiom of choice", The Journal of Symbolic Logic, 50 (2): 458–467, doi:10.2307/2274234, JSTOR 2274234, MR 0793126, S2CID 33535673.

st-andrews.ac.uk

mathshistory.st-andrews.ac.uk

O'Connor, John J.; Robertson, Edmund F., "Otto Schreier", MacTutor History of Mathematics Archive, University of St Andrews

uchicago.edu

math.uchicago.edu

May, J. Peter (1999). "Section 4.5". A Concise Course in Algebraic Topology (PDF). University of Chicago Press. ISBN 9780226511832.

zbmath.org

Fried & Jarden (2008), p. 355 Fried, Michael D.; Jarden, Moshe (2008), Field arithmetic, Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge, vol. 11 (3rd ed.), Springer-Verlag, p. 70, ISBN 978-3-540-77269-9, Zbl 1145.12001.