@article{MZM_2005_78_1_a2,
     author = {V. F. Butuzov and M. A. Terent'ev},
     title = {Singular {Perturbation} {Elliptic} {Boundary-Value} {Problems} in the {Case} of a {Nonisolated} {Root} of the {Degenerate} {Equation}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {26--36},
     publisher = {mathdoc},
     volume = {78},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_1_a2/}
}