@misc{indiciae7f3bad10fed4,
  title = {Optical hole burning and spectral diffusion in ruby.},
  author = {A Szabo and R Kaarli},
  year = {1991},
  doi = {10.1103/physrevb.44.12307},
  url = {https://pubmed.ncbi.nlm.nih.gov/9999385/},
  note = {Source identifier: 9999385}
}