@article{FoersterSchaepersMueller2007,
  author    = {Arnold F{\"o}rster and T. Sch{\"a}pers and F. M{\"u}ller},
  title     = {Control of ballistic electrons in (AlGa)As/GaAs heterostructures by means of superconducting niobium gate structures / T. Sch{\"a}pers ; F. M{\"u}ller ; A. F{\"o}rster ...},
  journal   = {Surface Science. 305 (1994), H. 1-3},
  pages     = {460 -- 464},
  year      = {2007},
}