MathSciNet bibliographic data MR1501611 11D09 Ward, Morgan Conditions for the solubility of the Diophantine equation \$x\sp 2-My\sp 2=-1\$$x\sp 2-My\sp 2=-1$. Trans. Amer. Math. Soc. 33 (1931), no. 3, 712–718. Article

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