MathSciNet bibliographic data MR1703679 11D25 Walsh, Gary A note on a theorem of Ljunggren and the Diophantine equations \$x\sp 2-kxy\sp 2+y\sp 4=1,4\$$x\sp 2-kxy\sp 2+y\sp 4=1,4$. Arch. Math. (Basel) 73 (1999), no. 2, 119–125. Article

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