@misc{indiciaeaba96c5e1f32,
  title = {Levinson's theorem for the Dirac equation.},
  author = {N Poliatzky},
  year = {1993},
  doi = {10.1103/physrevlett.70.2507},
  url = {https://pubmed.ncbi.nlm.nih.gov/10053581/},
  note = {Source identifier: 10053581}
}