15- en 290-stelling: verschil tussen versies

* 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/publicaties/het-290-vermoeden-bewezen Kennislink: Het 290 vermoeden]

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