@article{bwmeta1.element.bwnjournal-article-aav78i2p153bwm, author = {Umberto Zannier}, title = {Remarks on a question of Skolem about the integer solutions of x1x2 - x3x4 = 1}, journal = {Acta Arithmetica}, volume = {76}, year = {1996}, pages = {153-164}, zbl = {0867.11013}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav78i2p153bwm} }
Umberto Zannier. Remarks on a question of Skolem about the integer solutions of x₁x₂ - x₃x₄ = 1. Acta Arithmetica, Tome 76 (1996) pp. 153-164. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav78i2p153bwm/
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