@article{RM_2009_64_1_a18,
     author = {V. A. Zorich},
     title = {A non-removable singularity of a~quasi-conformal immersion},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {173--174},
     year = {2009},
     volume = {64},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2009_64_1_a18/}
}