Integral operators in the theory of linear partial differential equations. Bergman, S. Springer-Verlag New York Inc., New York, 1969.
bibtex   
@book {MR0239239,
    AUTHOR = {Bergman, Stefan},
     TITLE = {Integral operators in the theory of linear partial
              differential equations},
    SERIES = {Second revised printing. Ergebnisse der Mathematik und ihrer
              Grenzgebiete, Band 23},
 PUBLISHER = {Springer-Verlag New York Inc., New York},
      YEAR = {1969},
     PAGES = {x+145},
   MRCLASS = {35.00},
  MRNUMBER = {0239239 (39 \#596)},
  BOEKCODE = {35C15},
}

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