@Book{Scherrer:2001,
  author = {Scherrer, Christoph and Greven, Thomas},
  title  = {Global rules for trade},

  year   = {2001},
  number = {},
  url    = {http://opac.bibliothek.uni-kassel.de/DB=1/PPN?PPN=093107099},

  const  = {\ text}
}