%0 Journal Article %A J. Cohn %T The Diophantine equation $y^2 = Dx^4 + 1$, II %J Acta Arithmetica %D 1975 %P 273-275 %V 28 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-28-3-273-275/ %R 10.4064/aa-28-3-273-275 %G en %F 10_4064_aa_28_3_273_275