@article{SM_1996_187_1_a1,
     author = {G. V. Grishina},
     title = {A priori estimates and smoothness of solutions of a~system of quasi-linear equations that is elliptic in {the~Douglis--Nirenberg} sense},
     journal = {Sbornik. Mathematics},
     pages = {15--38},
     publisher = {mathdoc},
     volume = {187},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_1_a1/}
}