@misc{indiciaefbf800cba430,
  title = {Exact space-time propagator for the step potential.},
  author = {de Carvalho TO},
  year = {1993},
  doi = {10.1103/physreva.47.2562},
  url = {https://pubmed.ncbi.nlm.nih.gov/9909224/},
  note = {Source identifier: 9909224}
}