@article{SM_2003_194_12_a4,
     author = {A. B. Shishkin},
     title = {Spectral synthesis for systems of differential operators with},
     journal = {Sbornik. Mathematics},
     pages = {1865--1898},
     year = {2003},
     volume = {194},
     number = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_12_a4/}
}