@book{Berger-Nonlinearity-1977,
  mrnumber = {MR0488101 (58 \#7671)},
  author = {Berger, Melvin S.},
  mrclass = {58-02 (47H15 58EXX 69.00)},
  mrreviewer = {J. E. Marsden},
  address = {New York},
  title = {Nonlinearity and functional analysis},
  isbn = {0-12-090350-4},
  publisher = {Academic Press},
  year = {1977},
  pages = {xix+417},
}