@InProceedings{langdon:1999:fairxo,
  author =       "W. B. Langdon",
  title =        "Size Fair and Homologous Tree Genetic Programming
                 Crossovers",
  booktitle =    "Proceedings of the Genetic and Evolutionary
                 Computation Conference",
  year =         "1999",
  editor =       "Wolfgang Banzhaf and Jason Daida and Agoston E. Eiben
                 and Max H. Garzon and Vasant Honavar and Mark Jakiela
                 and Robert E. Smith",
  volume =       "2",
  pages =        "1092--1097",
  address =      "Orlando, Florida, USA",
  publisher_address = "San Francisco, CA 94104, USA",
  month =        "13-17 " # jul,
  publisher =    "Morgan Kaufmann",
  keywords =     "genetic algorithms, genetic programming, bloat
                 reduction, evolution of shape, subquadratic length
                 growth, linear depth growth, uniform initialisation,
                 binary tree search spaces",
  ISBN =         "1-55860-611-4",
  URL =          "ftp://ftp.cwi.nl/pub/W.B.Langdon/papers/WBL.geccco99.fairxo.ps.gz",
  abstract =     "Size fair and homologous crossover genetic operators
                 for tree based genetic programming are described and
                 tested. Both produce considerably reduced increases in
                 program size and no detrimental effect on GP
                 performance. GP search spaces are partitioned by the
                 ridge in the number of program versus their size and
                 depth. A ramped uniform random initialisation is
                 described which straddles the ridge. With subtree
                 crossover trees increase about one level per generation
                 leading to sub-quadratic bloat in length.",
  notes =        "GECCO-99, part of banzhaf:1999:gecco99 See also
                 langdon:1999:fairxoTR A joint meeting of the eighth
                 international conference on genetic algorithms
                 (ICGA-99) and the fourth annual genetic programming
                 conference (GP-99)",
}