@unpublished{HuberBollin2013,
  author  = {Klaus Huber and Elmar Bollin},
  title   = {Langzeitmonitoring von solarthermischen Gro{\"s}anlagen},
  institution = {INES - Institut f{\"u}r nachhaltige Energiesysteme},
  year    = {2013},
  language  = {de}
}