@article{DAN_1967_175_3_a4,
     author = {S. L. Krushkal'},
     title = {Extremal quasiconformal mappings with a given boundary correspondence},
     journal = {Doklady Akademii Nauk},
     pages = {525--527},
     publisher = {mathdoc},
     volume = {175},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_175_3_a4/}
}