@article{6820,
  author = {R. K. Zhukavin and V. N. Shastin and S. G. Pavlov and H.-W. Hübers and J. N. Hovenier and T. O. Klaassen and A. F. G. van der Meer},
  title = {Terahertz gain on shallow donor transitions in silicon},
  year = {2007},
  journal = {Journal of Applied Physics},
  volume = {102},
  pages = {093104},
  language = {eng},
}