@article{DAN_1964_159_2_a10,
     author = {M. P. Semenov},
     title = {On the solubility of boundary-value problems for quasi-linear elliptic systems},
     journal = {Doklady Akademii Nauk},
     pages = {276--278},
     publisher = {mathdoc},
     volume = {159},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_2_a10/}
}