@article{wickenbrock2013pra,
  title = {Collective strong coupling in multimode cavity QED},
  author = {Wickenbrock, A. and Hemmerling, M. and Robb, G. R. M. and Emary, C. and Renzoni, F.},
  journal = {Phys. Rev. A},
  volume = {87},
  issue = {4},
  pages = {043817},
  numpages = {8},
  year = {2013},
  month = {Apr},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevA.87.043817},
  url = {https://link.aps.org/doi/10.1103/PhysRevA.87.043817}
}