@article{DuanHeBraaketal.2015,
  author    = {Liwei Duan and Shu He and Daniel Braak and Qing-Hu Chen},
  title     = {Solution of the two-mode quantum Rabi model using extended squeezed states},
  journal   = {EPL (Europhysics Letters)},
  volume    = {112},
  number    = {3},
  pages     = {34003},
  doi       = {10.1209/0295-5075/112/34003},
  year      = {2015},
}