@article{SM_1986_54_1_a1,
     author = {V. V. Andrievskii},
     title = {The geometric structure of regions, and direct theorems of the constructive theory of functions},
     journal = {Sbornik. Mathematics},
     pages = {39--56},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_54_1_a1/}
}