@article{unknown2010a,
  title={A functional crossover operator for genetic programming},
  author={Joshua Bongard},
  journal={Genetic Programming Theory and Practice VII},
  pages={195-210},
  journalpage={https://link.springer.com/chapter/10.1007%2F978-1-4419-1626-6_12},
  year={2010},
  citations={}
}