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References

1. L. E. J. Brouwer at the Mathematics Genealogy Project https://www.genealogy.math.ndsu.nodak.edu/id.php?id=19467
2. O'Connor, John J.; Robertson, Edmund F., "L. E. J. Brouwer", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Brouwer.html .
3. Atten, Mark van. "Luitzen Egbertus Jan Brouwer". in Zalta, Edward N.. Stanford Encyclopedia of Philosophy. https://plato.stanford.edu/entries/brouwer/. 
4. "Luitzen E.J. Brouwer (1881 - 1966)". Royal Netherlands Academy of Arts and Sciences. http://www.dwc.knaw.nl/biografie/pmknaw/?pagetype=authorDetail&aId=PE00004406. Retrieved 21 July 2015. 
5. Brouwer, L. E. J. "Die mögliche Mächtigkeiten." Atti IV Congr. Intern. Mat. Roma 3 (1908): 569–571. https://babel.hathitrust.org/cgi/pt?id=iau.31858027749682;view=1up;seq=593
6. Brouwer, L. E. J. (1912). Sur la notion de «Classe» de transformations d'une multiplicité. Proc. 5th Intern. Math. Congr. Cambridge, 2, 9–10. https://pdfs.semanticscholar.org/b90a/89587ec4436cb0a7d03124fea2430b7e8bdc.pdf
7. L. E. J. Brouwer (trans. by Arnold Dresden) (1913). "Intuitionism and Formalism". Bull. Amer. Math. Soc. 20 (2): 81–96. doi:10.1090/s0002-9904-1913-02440-6.  https://dx.doi.org/10.1090%2Fs0002-9904-1913-02440-6
8. "...Brouwer and Schopenhauer are in many respects two of a kind." Teun Koetsier, Mathematics and the Divine, Chapter 30, "Arthur Schopenhauer and L.E.J. Brouwer: A Comparison," p. 584.
9. Brouwer wrote that "the original interpretation of the continuum of Kant and Schopenhauer as pure a priori intuition can in essence be upheld." (Quoted in Vladimir Tasić's Mathematics and the roots of postmodernist thought, § 4.1, p. 36)
10. “Brouwer’s debt to Schopenhauer is fully manifest. For both, Will is prior to Intellect." [see T. Koetsier. “Arthur Schopenhauer and L.E.J. Brouwer, a comparison,” Combined Proceedings for the Sixth and Seventh Midwest History of Mathematics Conferences, pages 272–290. Department of Mathematics, University of Wisconsin-La Crosse, La Crosse, 1998.]. (Mark van Atten and Robert Tragesser, “Mysticism and mathematics: Brouwer, Gödel, and the common core thesis,” Published in W. Deppert and M. Rahnfeld (eds.), Klarheit in Religionsdingen, Leipzig: Leipziger Universitätsverlag 2003, pp.145–160)
11. "Interview with B L van der Waerden, reprinted in AMS March 1997". American Mathematical Society. http://www.ams.org/notices/199703/interview.pdf. Retrieved 13 November 2015. 
12. Kreisel, G. (1977). "Review: L. E. J. Brouwer collected works, Volume I, Philosophy and foundations of mathematics ed. by A. Heyting". Bull. Amer. Math. Soc. 83: 86–93. doi:10.1090/S0002-9904-1977-14185-2. http://www.ams.org/journals/bull/1977-83-01/S0002-9904-1977-14185-2/S0002-9904-1977-14185-2.pdf.