MathSciNet bibliographic data MR197390 10.12 Ljunggren, W. Some remarks on the diophantine equations $x\sp{2}-{\cal D}y\sp{4}=1$$x\sp{2}-{\cal D}y\sp{4}=1$ and $x\sp{4}-{\cal D}y\sp{2}=1$$x\sp{4}-{\cal D}y\sp{2}=1$. J. London Math. Soc. 41 1966 542–544. Article

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