%0 Journal Article %A Puqi Tang %T Regularity and extremality of quasiconformal homeomorphisms on CR 3-manifolds %J Annales Fennici Mathematici %D 1996 %P 289-308 %V 21 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AFM_1996_21_2_a3/ %G en %F AFM_1996_21_2_a3