@techreport(langdon:1995:dc,
  author = 	{W. B. Langdon},
  title =	{Directed Crossover within Genetic Programming},
  institution =	{University College London},
  year = 	1995,
  type =	{Research Note},
  number =	{RN/95/71},
  address =	{Gower Street, London WC1E 6BT, UK},
  month =	{September},
  note =	{},
  keywords =    {Genetic Programming, Genetic Algorithms, 
        Automatic Programming, Machine Learning, 
	Artificial Evolution},
  url =         {ftp://cs.ucl.ac.uk/genetic/papers/directed_crossover.ps},
  abstract =	{This paper describes in detail a mechanism used to
bias the choice of crossover locations when evolving a list data
structure using genetic programming. The data structure and it
evolution will be described by RN 95/70.

The second section describes current research on biasing the action of
reproduction operators within the genetic programming field.
},
  notes = 	{},
  size = 	{4 pages}
)