@misc{W2067204178,
  author = {Marek Żukowski and Anton Zeilinger and M. A. Horne and A. K. Ekert},
  title = {‘‘Event-ready-detectors’’ Bell experiment via entanglement swapping},
  year = {1993},
  howpublished = {Physical Review Letters},
  doi = {https://doi.org/10.1103/physrevlett.71.4287}
}