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
DOI:
https://doi.org/10.1090/S0002-9904-1938-06768-7
MathSciNet review:
1563757
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Additional Information
DOI:
https://doi.org/10.1090/S0002-9904-1938-06768-7