A note on numbers of the form $a^2 + \alpha b^2 + \beta c^2 + \alpha \beta d^2$
Thrall, Robert M.
Bull. Amer. Math. Soc., Tome 44 (1938) no. 11, p. 404-407 / Harvested from Project Euclid
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Publié le : 1938-06-14
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@article{1183500530,
     author = {Thrall, Robert M.},
     title = {A note on numbers of the form $a^2 + \alpha b^2 + \beta c^2 + \alpha \beta d^2$},
     journal = {Bull. Amer. Math. Soc.},
     volume = {44},
     number = {11},
     year = {1938},
     pages = { 404-407},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183500530}
}

Thrall, Robert M. A note on numbers of the form $a^2 + \alpha b^2 + \beta c^2 + \alpha \beta d^2$. Bull. Amer. Math. Soc., Tome 44 (1938) no. 11, pp.  404-407. http://gdmltest.u-ga.fr/item/1183500530/