Rectangles and Quasiconformal Mappings.
Rectifiability in Teichmüller theory
Regularity theorems for solutions of partial differential equations for quasiconformal mappings in several dimensions [Book]
Remarks on Hersch-Pfluger Theorem.
Removable singularities for Hölder continuous quasiregular mappings in the plane.
Ricci curvature and qusiconformal deformations of a Riemannian manifold.