@misc{indiciaeea96c3770f21,
  title = {Positronium at surfaces.},
  author = {PM Platzman and N Tzoar},
  year = {1986},
  doi = {10.1103/physrevb.33.5900},
  url = {https://pubmed.ncbi.nlm.nih.gov/9939122/},
  note = {Source identifier: 9939122}
}