@Inproceedings{stumme2004iceberg,
  author = {Stumme, Gerd},
  title  = {Iceberg Query Lattices for Datalog},

  year   = {2004},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/stumme/papers/2004/stumme2004iceberg.pdf},

  const  = {\ text}
}