@article{SM_1971_14_1_a3,
     author = {M. A. Shubin},
     title = {Factorization of matrices depending on a~parameter, and elliptic equations in a~halfspace},
     journal = {Sbornik. Mathematics},
     pages = {65--84},
     year = {1971},
     volume = {14},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_14_1_a3/}
}