@article{RM_2002_57_3_a16,
     author = {S. A. Stepin and A. A. Arzhanov},
     title = {On localization of the spectrum in a~problem in singular perturbation theory},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {608--610},
     publisher = {mathdoc},
     volume = {57},
     number = {3},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2002_57_3_a16/}
}