@BOOK{Jezequel99,
  title = {{D}esign {P}atterns and {Contracts}},
  publisher = {Addison-Wesley},
  year = {1999},
  author = {J\'{e}z\'{e}quel, J.-M. and Train, M. and Mingins, C.},
  month = oct,
  note = {ISBN 1-201-30959-9}
}