MathSciNet bibliographic data MR512268 10B10 Cohn, J. H. E. The Diophantine equation \$y\sp{2}=Dx\sp{4}+1\$$y\sp{2}=Dx\sp{4}+1$. III. Math. Scand. 42 (1978), no. 2, 180–188. Article

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