@article{SM_2006_197_2_a8,
     author = {N. A. Shananin},
     title = {Solubility on compact subsets for differential equations with real principal pencil of symbols},
     journal = {Sbornik. Mathematics},
     pages = {281--302},
     year = {2006},
     volume = {197},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_2_a8/}
}