?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Langdon&rft.au=Langdon%2C+WB&rft.aufirst=WB&rft.pages=71-104&rft.title=Genetic+Programming+and+Evolvable+Machines&rft.atitle=Genetic+programming+convergence&rft.volume=23&rft.date=March+2021&rft.genre=article