%0 Journal Article %A Jun Hu %T Characterizations of circle homeomorphisms of different regularities in the universal Teichmüller space %J EMS surveys in mathematical sciences %D 2022 %P 321-353 %V 9 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/emss/60/ %R 10.4171/emss/60 %F 10_4171_emss_60