@BOOK{BoFi,
  author =       "M.Bobrovnikov, V.Firsanov",
  title =        "Wave diffraction in angular domains (in russian)",
  publisher=     "{Tomsk} State University",
  year =         "1988",
  address =      "Tomsk"
}
%
@ARTICLE{BF1,
  author =       "V.Buslaev, A.Fedotov",
  title =        "The functional structure of a monodromy matrix for {Harper} equation",
  journal =      "{Operator} {Theory}: {Advances} and {Applications}",
  year =         "1994",
  volume =       "70",
  pages =        "321-342"
}
%
@TECHREPORT{BF2,
  author =       "V. Buslaev, A. Fedotov",
  title =        "On a class of matrices related to {Harper} equation",
  institution =  "{Mittag}-{Leffler} {Institute}",
  year =         "1993",
  type =         "preprint",
  number =       "19",
  pages=         "1-37"
}
%
@ARTICLE{BF3,
  author =       "V. Buslaev, A. Fedotov",
  title =        "Complex {WKB} method for {Harper} equation. {I}",
  journal =      "{Algebra} and {Analysis} (in
russian, transl.in english: in {S}t.{P}etersburg {J}our.of
{M}ath.)",
  year =         "1994",
  volume =       "6",
  number =       "3",
  pages =        "59-83"
}
%
@InProceedings{BF4,
  author =       "V. Buslaev, A. Fedotov",
  title =        "Monodromization and {Harper} equation",
  booktitle =    "Equations aux d\'eriv\'ees partielles",
  year =         "1994",
  publisher =    "{E}cole {P}olytechnique",
  address =      "Paris, {F}rance",
  pages =        "{X}{X}{I}-1 -- {X}{X}{I}-21"
}
%
@ARTICLE{BF5,
  author =       "V. Buslaev, A. Fedotov",
  title =        "Bloch solutions of difference equations",
  journal =      "Algebra and Analysis (in russian, engl.
translation in St.Petersburg Jour. of Math.)",
  year =         "1995",
  volume =       "7",
  number =       "4",
  pages =        "74-121"
}
%
@ARTICLE{BF6,
  author =       "V.Buslaev, A.Fedotov",
  title =        "Harper equation:
Monodromization without semiclassics",
  journal =      "Algebra
and Analysis (in russian, engl. translation in St.Petersburg Jour.
of Math.)",
  year =         "1996",
  volume =       "8",
  number =       "2",
  pages =        "75-109"
}
%
@InProceedings{BF7,
  author =       "V. Buslaev, A. Fedotov",
  title =        "Spectral
properties of the monodromy matrix for Harper equation",
  booktitle =    "\'Equations aux
d\'eriv\'ees partielles (Saint-Jean-de-Monts)",
  year =         "1997",
  publisher =    "{E}cole {P}olytechnique",
  address =      "Paris, {F}rance",
  pages =        "{I}{V}-1 -- {I}{V}-11"
}
%
@InProceedings{BF8,
  author =       "V. Buslaev, A. Fedotov",
  title =        "Minimal solutions of difference equations with periodic coefficients",
  booktitle =    "XIIth International Congress of Mathematical Physics ",
  year =         "1999",
  publisher =    "International {P}ress",
  address =      "Boston",
  pages =        "303-308"
}
%
@TECHREPORT{BF9,
  author =       "V.Buslaev, A.Fedotov",
  title =        "Difference equations with periodic coefficients",
  institution =  "Universit\'e {P}aris {N}ord",
  year =         "1997",
  type =         "Pr\'epublications {M}ath\'ematiques",
  number =       "97-18",
  address =      "Paris, France",
  pages=         "1-56"
}
%
@ARTICLE{HS,
  author =       "B.Helffer, J.Sjostrand",
  title =        "Analyse semi-classique pour l'\'equation de {Harper}",
  journal =      "M\'emoire de la {S}{M}{F}",
  year =         "1988",
  volume =       "34"
}
%
@ARTICLE{W,
  author =       "M. Wilkinson",
  title =        "Critical properties of electron eigenstates in incommensurate systems",
  journal =      "Proc. Royal Society of London. A",
  year =         "1984",
  volume =       "391",
  pages =        "305--350"
}