@article{FoersterSchoenhutMetzner2007,
  author    = {Arnold F{\"o}rster and J. Sch{\"o}nhut and C. Metzner},
  title     = {Optical investigation of impurity bands in a delta-doped n-layer / J. Sch{\"o}nhut ; C. Metzner ; S. M{\"u}ller ... A. F{\"o}rster ...},
  journal   = {Solid state electronics. 40 (1996), H. 1-8},
  pages     = {701 -- 705},
  year      = {2007},
}