MathSciNet bibliographic data MR1770484 (2001h:11034) 11D25 (11J86) Walsh, P. G. Diophantine equations of the form $aX\sp 4-bY\sp 2=\pm 1$$aX\sp 4-bY\sp 2=\pm 1$. Algebraic number theory and Diophantine analysis (Graz, 1998), 531–554, de Gruyter, Berlin, 2000. Links to the journal or article are not yet available

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