@article{SM_2002_193_4_a4,
     author = {A. A. Oblomkov},
     title = {Spectral properties of two classes of periodic difference operators},
     journal = {Sbornik. Mathematics},
     pages = {559--584},
     publisher = {mathdoc},
     volume = {193},
     number = {4},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_4_a4/}
}