On homeomorphisms with finite distortion in the plane
arXiv:1011.3310
Abstract
It is shown that every homeomorphism f of finite distortion in the plane is the so-called lower Q-homeomorphism with Q(z)=K_f(z), and, on this base, it is developed the theory of the boundary behavior of such homeomorphisms.
16 pages, 2 figures, the proof of Theorem 3.1