@Book {Bourbaki76,
  author =       {Nicolas Bourbaki},
  title =        {{\'E}l{\'e}ments de math{\'e}matique {F}onctions d'une 
                  variable r{\'e}elle {T}h{\'e}orie {\'e}l{\'e}mentaire},
  publisher =    {Hermann},
  year =         1976
}