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Lua i Stíl Chicago (17ú heag.)SpringerLink (Online service), Jeffrey C. Lagarias, agus Samuel Ferguson. The Kepler Conjecture: The Hales- Ferguson Proof by Thomas Hales, Samuel Ferguson. New York: Birkhäuser, 2011.
Lua MLA (9ú heag.)SpringerLink (Online service), et al. The Kepler Conjecture: The Hales- Ferguson Proof by Thomas Hales, Samuel Ferguson. Birkhäuser, 2011.
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