@misc{indiciae8c9ff65c77ca,
  title = {Two-photon spectroscopy in KCl:Eu2+},
  author = {M Casalboni and R Francini and UM Grassano and R Pizzoferrato},
  year = {1986},
  doi = {10.1103/physrevb.34.2936},
  url = {https://pubmed.ncbi.nlm.nih.gov/9940005/},
  note = {Source identifier: 9940005}
}