MathSciNet bibliographic data MR1840950 11D25 Luca, F.; Walsh, P. G. A generalization of a theorem of Cohn on the equation $x^3-Ny^2=\pm 1$$x^3-Ny^2=\pm 1$. Rocky Mountain J. Math. 31 (2001), no. 2, 503–509. Article

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