%0 Journal Article %A Lee Mosher %A Michah Sageev %A Kevin Whyte %T Quasi-actions on trees I. Bounded valence %J Annals of mathematics %D 2003 %P 115-164 %V 158 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4007/annals.2003.158.115/ %R 10.4007/annals.2003.158.115 %G en %F 10_4007_annals_2003_158_115