@misc{indiciae0a149efad91d,
  title = {Invariants for time-dependent Hamiltonian systems.},
  author = {J Struckmeier and C Riedel},
  year = {2001},
  doi = {10.1103/physreve.64.026503},
  url = {https://pubmed.ncbi.nlm.nih.gov/11497721/},
  note = {Source identifier: 11497721}
}