@misc{indiciaec185becd20aa,
  title = {Squeezing in harmonic oscillators with time-dependent frequencies.},
  author = {X Ma and W Rhodes},
  year = {1989},
  doi = {10.1103/physreva.39.1941},
  url = {https://pubmed.ncbi.nlm.nih.gov/9901449/},
  note = {Source identifier: 9901449}
}