@misc{krger2003nonlinear,
  title={Nonlinear Dynamics In Quantum Physics -- Quantum Chaos and Quantum Instantons},
  author={H. Kröger},
  year={2003},
  eprint={quant-ph/0302169},
  archivePrefix={arXiv},
  primaryClass={quant-ph},
  url={https://arxiv.org/abs/quant-ph/0302169}
}