15- en 290-stelling: verschil tussen versies

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*Conway, J. H. [http://www.fen.bilkent.edu.tr/~franz/mat/15.pdf ''Universal quadratic forms and the fifteen theorem.''] Quadratic forms and their applications (Dublin, 1999), 23--26, Contemp. Math., 272, Amer. Math. Soc., Providence, RI, 2000.
*[http://www.kennislink.nl/web/show?id=154148 Kennislink: Het 290 vermoeden]
*[http://www.sciencenews.org/articles/20060311/bob9.asp Artikel in Science News Online] {{en}}
*[http://www.math.duke.edu/~jonhanke/290/Universal-290.html "Universal quadratic forms and the 290-Theorem" - bronnenpagina]
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