@article{Salmon:117478,
      author        = "Salmon, W. and Gustin, C. and Settineri, A. and Di
                       Stefano, O. and Zueco, D. and Savasta, S. and Nori, F. and
                       Hughes, S.",
      title         = "{Gauge-independent emission spectra and quantum
                       correlations in the ultrastrong coupling regime of open
                       system cavity-QED}",
      year          = "2022",
}