@book {MR678094,
    AUTHOR = {Kato, Tosio},
     TITLE = {A short introduction to perturbation theory for linear
              operators},
 PUBLISHER = {Springer-Verlag},
   ADDRESS = {New York},
      YEAR = {1982},
     PAGES = {xiii+161},
      ISBN = {0-387-90666-5},
   MRCLASS = {47A55 (15-02)},
  MRNUMBER = {678094 (83m:47015)},
  BOEKCODE = {47A55},
}

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