@Book{Clark:2002:OCL,
  editor =       "Tony Clark and Jos Warmer",
  title =        "Object Modeling with the {OCL}: The Rationale behind the
                  Object Constraint Language",
  publisher =    "Springer",
  year =         "2002",
  volume =       "2263",
  series =       "LNCS",
  isbn =         "3-540-43169-1",
}