@unpublished{HilczerGerhardScott2014,
  author    = {Hilczer, B{\"o}rn and Gerhard, Reimund and Scott, James F.},
  title     = {Special Issue of Ferroelectrics in Honor of S. B. Lang},
  series = {Ferroelectrics},
  volume    = {472},
  journal   = {Ferroelectrics},
  number    = {1},
  publisher = {Routledge, Taylor \& Francis Group},
  address   = {Abingdon},
  issn      = {0015-0193},
  doi       = {10.1080/00150193.2014.964099},
  pages     = {VII -- VIII},
  year      = {2014},
  language  = {en}
}
@unpublished{Gerhard2014,
  author    = {Gerhard, Reimund},
  title     = {Sidney Lang - his collaboration with the University of Potsdam},
  series = {Ferroelectrics},
  volume    = {472},
  journal   = {Ferroelectrics},
  number    = {1},
  publisher = {Routledge, Taylor \& Francis Group},
  address   = {Abingdon},
  issn      = {0015-0193},
  doi       = {10.1080/00150193.2014.967090},
  pages     = {5 -- 5},
  year      = {2014},
  language  = {en}
}