@misc{indiciaef664e61522af,
  title = {Quantum beats in photon echo from four-waving mixing.},
  author = {X Zhu and MS Hybertsen and PB Littlewood},
  year = {1994},
  doi = {10.1103/physrevlett.73.209},
  url = {https://pubmed.ncbi.nlm.nih.gov/10056757/},
  note = {Source identifier: 10056757}
}