@misc{W2084685553,
  author = {Jian-Wei Pan and Dik Bouwmeester and Harald Weinfurter and Anton Zeilinger},
  title = {Experimental Entanglement Swapping: Entangling Photons That Never Interacted},
  year = {1998},
  howpublished = {Physical Review Letters},
  doi = {https://doi.org/10.1103/physrevlett.80.3891}
}