Regularity and extremality of quasiconformal homeomorphisms on CR 3-manifolds. Tang, Puqi — 1996 Annales Academiae Scientiarum Fennicae. Mathematica
Quasiconformal homeomorphisms on CR 3-manifolds with symmetries. Puqi Tang — 1995 Mathematische Zeitschrift
Uniform domains and quasiconformal mappings on the Heisenberg groups. Puqi Tang; Luca Gapogna — 1995 Manuscripta mathematica