MathSciNet bibliographic data MR1438594 (98e:11033) 11D25 Cohn, J. H. E. The Diophantine equation \$x\sp 4-Dy\sp 2=1\$$x\sp 4-Dy\sp 2=1$. II. Acta Arith. 78 (1997), no. 4, 401–403. Journal

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