@article{MenzelHeuerMilonni2019,
  author    = {Ralf Menzel and Axel Heuer and Peter W. Milonni},
  title     = {Entanglement, Complementarity, and Vacuum Fields in Spontaneous Parametric Down-Conversion},
  journal   = {Atoms},
  volume    = {7},
  number    = {1},
  doi       = {10.3390/atoms7010027},
  year      = {2019},
}