@article{SM_2008_199_4_a3,
     author = {Yu. V. Egorov and V. A. Kondratiev},
     title = {Asymptotic behaviour of solutions of},
     journal = {Sbornik. Mathematics},
     pages = {539--556},
     year = {2008},
     volume = {199},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2008_199_4_a3/}
}