@article{icke2013modeling,
  title={Modeling Hierarchy using Symbolic Regression},
  author={Ilknur Icke and Joshua Bongard},
  journal={Evolutionary Computation (CEC), 2013 IEEE Congress on},
  pages={2980-2987},
  journalpage={http://www.cs.uvm.edu/~jbongard/papers/2013_CEC_Icke_2.pdf},
  year={2013},
  citations={}
}