@misc{indiciae7dfb102f25c9,
  title = {Gradient correction for positron states in solids.},
  author = {B Barbiellini and MJ Puska and T Torsti and RM Nieminen},
  year = {1995},
  doi = {10.1103/physrevb.51.7341},
  url = {https://pubmed.ncbi.nlm.nih.gov/9977308/},
  note = {Source identifier: 9977308}
}