@article{DAN_1975_221_3_a13,
     author = {V. N. Maslennikova and M. E. Bogovskii},
     title = {Sobolev systems in two spatial variables},
     journal = {Doklady Akademii Nauk},
     pages = {563--566},
     publisher = {mathdoc},
     volume = {221},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_3_a13/}
}