@article{Koertetal20,
  title = {Incremental Learning of an Open-Ended Collaborative Skill Library},
  journal = {International Journal of Humanoid Robotics},
  volume = {17},
  number = {1},
  year = {2020},
  author = {Koert, D. and Trick, S. and Ewerton, M. and Lutter, M. and Peters, J.},
  doi = {10.1142/S0219843620500012}
}