@conference{Rottmannetal20,
  title = {Learning Hierarchical Acquisition Functions for Bayesian Optimization},
  booktitle = {International Conference on Intelligent Robots and Systems (IROS)},
  pages = {5490--5496},
  publisher = {IEEE},
  year = {2020},
  author = {Rottmann, N. and Kunavar, T. and Babic, J. and Peters, J. and Rueckert, E.},
  doi = {10.1109/IROS45743.2020.9341335}
}