@article{VTGU_2009_4_a5,
     author = {V. A. Shchepetev},
     title = {About distortion theorems for one class quasi-conformal mappings, conformal outside a ring},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {65--74},
     year = {2009},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2009_4_a5/}
}