We study the quadratic integral points--that is, (-)integral points defined over any extension of degree two of the base field--on a curve defined in by a system of two Pell equations. Such points belong to three families explicitly described, or belong to a finite set whose cardinality may be explicitly bounded in terms of the base field, the equations defining the curve and the set . We exploit the peculiar geometry of the curve to adapt the proof of a theorem of Vojta, which in this case does not apply.
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Francesco Veneziano, Quadratic Integral Solutions to Double Pell Equations. Rend. Sem. Mat. Univ. Padova 126 (2011), pp. 47–61DOI 10.4171/RSMUP/126-3