Zhong, Li et Guizhen, Cui, A Note on Mori's Theorem of K-quasiconformal Mappings, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 9(1), 1993, pp. 55-62
The distortion problem of K-quasiconformal mappings of the unit disk D = {z: |< 1) onto itself with the original fixed is discussed, a new estimate is given.