@article{spannagel2007,
  title={Animated demonstrations and training wheels interfaces in a complex learning environment},
  author={Christian Spannagel and Raimund Girwidz and Herbert Löthe and Andreas Zendler and Ulrik Schroeder},
  year={2007},
  journal={Interacting with Computers},
  doi={10.1016/j.intcom.2007.08.002},
  url={https://doi.org/10.1016/j.intcom.2007.08.002}
}