@misc{indiciae09142c7e8a14,
  title = {Effect of microstructure on positron-annihilation parameters in YBa2Cu3O7.},
  author = {SG Usmar and KG Lynn and AR Moodenbaugh and M Suenaga and RL Sabatini},
  year = {1988},
  doi = {10.1103/physrevb.38.5126},
  url = {https://pubmed.ncbi.nlm.nih.gov/9946936/},
  note = {Source identifier: 9946936}
}