@article{KhosropanahBaryshevZhangetal.2009,
  author    = {P. Khosropanah and A. Baryshev and W. Zhang and W. Jellema and J. N. Hovenier and J. R. Gao and T. M. Klapwijk and D. G. Paveliev and B. S. Williams and S. Kumar and Q. Hu and J. L. Reno and B. Klein and J. L. Hesler},
  title     = {Phase locking of a 2.7 THz quantum cascade laser to a microwave reference},
  series   = {Optics Letters},
  volume    = {34},
  number    = {19},
  publisher = {Optical Society of America},
  issn      = {0146-9592},
  doi       = {10.1364/OL.34.002958},
  pages     = {2958 -- 2960},
  year      = {2009},
  language  = {en}
}