%0 Journal Article
%A Umberto Zannier
%T Parametrizing ${\rm SL}_2({\Bbb Z})$ and a question of Skolem
%J Acta Arithmetica
%D 2003
%P 331-337
%V 110
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa110-4-2/
%R 10.4064/aa110-4-2
%G en
%F 10_4064_aa110_4_2