Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) A. Ridolfo and S. Savasta and M. J. Hartmann,Nonclassical Radiation from Thermal Cavities in the Ultrastrong Coupling Regime,Physical Review Letters,0031-9007,American Physical Society (APS),2013-04-15,110,16,163601,https://cir.nii.ac.jp/crid/1363107368668137728,https://doi.org/10.1103/physrevlett.110.163601