@article{DAN_1958_120_5_a6,
     author = {O. A. Ladyzhenskaya},
     title = {Differential properties of weak solutions of some $n$-dimensional variation problems},
     journal = {Doklady Akademii Nauk},
     pages = {956--959},
     year = {1958},
     volume = {120},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_120_5_a6/}
}