@article{SM_1967_1_1_a3,
     author = {O. V. Stepanova},
     title = {Some properties of level lines in univalent conformal mappings},
     journal = {Sbornik. Mathematics},
     pages = {61--82},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_1_a3/}
}