MathSciNet bibliographic data MR574794 (81g:10029) 10B05 (68C25) Lagarias, J. C. On the computational complexity of determining the solvability or unsolvability of the equation \$X\sp{2}-DY\sp{2}=-1\$$X\sp{2}-DY\sp{2}=-1$. Trans. Amer. Math. Soc. 260 (1980), no. 2, 485–508. Article

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