@article{DAN_1971_199_2_a4,
     author = {S. L. Krushkal'},
     title = {Some local theorems for quasi-conformal mappings of {Riemann} surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {269--272},
     publisher = {mathdoc},
     volume = {199},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_199_2_a4/}
}