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@article{10_4064_aa110_4_2, author = {Umberto Zannier}, title = {Parametrizing ${\rm SL}_2({\Bbb Z})$ and a question of {Skolem}}, journal = {Acta Arithmetica}, pages = {331--337}, publisher = {mathdoc}, volume = {110}, number = {4}, year = {2003}, doi = {10.4064/aa110-4-2}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa110-4-2/} }
Umberto Zannier. Parametrizing ${\rm SL}_2({\Bbb Z})$ and a question of Skolem. Acta Arithmetica, Tome 110 (2003) no. 4, pp. 331-337. doi : 10.4064/aa110-4-2. http://geodesic.mathdoc.fr/articles/10.4064/aa110-4-2/
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