MathSciNet bibliographic data MR842749 (87e:11042) 11D25 Zhu, Wei San Necessary and sufficient conditions for the solvability of the Diophantine equation \$x\sp 4-Dy\sp 2=1\$$x\sp 4-Dy\sp 2=1$. (Chinese) Acta Math. Sinica 28 (1985), no. 5, 681–683. Links to the journal or article are not yet available

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