@article{SM_2003_194_5_a0,
     author = {S. A. Golopuz},
     title = {The defining boundary conditions and the~degenerate problem for},
     journal = {Sbornik. Mathematics},
     pages = {641--668},
     year = {2003},
     volume = {194},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_5_a0/}
}