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We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.
"Space-Time." Encyclopaedia Britannica, 14th ed.
Teaching and Research with Original Sources from the Euler Archive
 Barnett, Janet. "Euler Circuits and the Königsberg Bridge Problem." Available online at http://www.math.nmsu.edu/hist_projects/
 Blecksmith, Richard, John Brillhart, and Michael Decaro. “The Completion of Euler’s Factoring Formula.” To appear in the Rocky Mountain Journal of Mathematics.
 Brillhart, John. “A Note on Euler's Factoring Problem.” American Mathematical Monthly 116:10 (2009), pp. 928-931.
 Caparrini, Sandro. “Euler’s Influence on the Birth of Vector Mechanics.” In Leonhard Euler: Life, Work and Legacy. Robert E. Bradley and Ed Sandifer (eds.), Elsevier, 2007, pp. 459-477.
 Klyve, Dominic and Lee Stemkoski. "The Euler Archive: Giving Euler to the World." In Euler at 300: An Appreciation. Robert Bradley, Lawrence D’Antonio, and Edward Sandifer (eds.), Mathematical Association of America, 2007, pp. 33-41.
 Knoebel, Art, Reinhard Laubenbacher, Jerry Lodder, and David Pengelley. Mathematical Masterpieces: Further Chronicles by the Explorers. Springer, 2007.
 Osler, Thomas. “Another look at Euler’s parallel oblique angled diameters.” To appear in The Mathematical Gazette.
 Osler, Thomas. “Euler and the functional equation for the zeta function.” The Mathematical Scientist, 34 (2009), pp. 62-73.
 Osler, Thomas. “Euler's little summation formula and special values of the zeta function.” The Mathematical Gazette, 92 (2008), pp. 295-299.
 Osler, Thomas and Andrew Robertson. “Euler's little summation formula and sums of powers,” Mathematical Spectrum, 40 (2006/2007), pp. 73-76.
 Petrie, Bruce J. "Euler, Lambert, and the Irrationality of e and π." Proceedings of the Canadian Society for History and Philosophy of Mathematics, 22 (2009), pp. 104-19.
 Pivkina, Inna. "Original historical sources in data structures and algorithms courses." Journal of Computing Sciences in Colleges, 26:4, April 2011.
 Sandifer, C. Edward. How Euler Did It (online column). Mathematical Association of America, 2007. Past columns also available online at: http://maa.org/news/howeulerdidit.html
 Stemkoski, Lee. "Investigating Euler's Polyhedral Formula Using Original Sources." Loci: Convergence, 6 (April 2009). DOI: 10.4169/loci003297. Available online at:
 Walter, Jacob and Thomas Osler. "A modern look at a neglected summation formula by Euler." The Mathematical Gazette, 93 (2009), pp. 237-243.
Klyve, Dominic, Lee Stemkoski and Erik Tou, "Teaching and Research with Original Sources from the Euler Archive," Loci (April 2011), DOI: 10.4169/loci003672