@misc{indiciaeee90325e1d8c,
  title = {Gamma echo.},
  author = {P Helistö and I Tittonen and M Lippmaa and T Katila},
  year = {1991},
  doi = {10.1103/physrevlett.66.2037},
  url = {https://pubmed.ncbi.nlm.nih.gov/10043374/},
  note = {Source identifier: 10043374}
}