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Bulletin of the American Mathematical Society

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A note on numbers of the form $a^2 + \alpha b^2 + \beta c^2 + \alpha \beta d^2$


Author: Robert M. Thrall
Journal: Bull. Amer. Math. Soc. 44 (1938), 404-407
MathSciNet review: 1563757
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DOI: https://doi.org/10.1090/S0002-9904-1938-06768-7