@article{DAN_1990_315_3_a5,
     author = {V. I. Ryazanov},
     title = {A closure theorem for quasiconformal mappings with integral},
     journal = {Doklady Akademii Nauk},
     pages = {540--543},
     publisher = {mathdoc},
     volume = {315},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_3_a5/}
}