Braver, S. (2011). Lobachevski illuminated. Mathematical Association of America.
Chicago-čujuhus (17. p.)Braver, Seth. Lobachevski Illuminated. [Washington, D.C.]: Mathematical Association of America, 2011.
MLA-čujuhus (9. p.)Braver, Seth. Lobachevski Illuminated. Mathematical Association of America, 2011.
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