@article{SM_1995_186_7_a2,
     author = {A. G. Eliseev},
     title = {Theory of singular perturbations with a~non-smooth spectrum of the~limit operator},
     journal = {Sbornik. Mathematics},
     pages = {951--966},
     year = {1995},
     volume = {186},
     number = {7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_7_a2/}
}