@misc{indiciae1cffae64beb0,
  title = {Accumulated photon echo in ruby and alexandrite.},
  author = {MH Overwijk and PJ Rump and JI Dijkhuis and de Wijn HW},
  year = {1991},
  doi = {10.1103/physrevb.44.4157},
  url = {https://pubmed.ncbi.nlm.nih.gov/10000061/},
  note = {Source identifier: 10000061}
}