@incollection{BERNHOLDKALINGLELLEK2012,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Productivity Measurement Model - A Holistic Approach For Services},
  series = {Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark, IN: JUNGHANS, A.; JENSEN, P. A. (Editors)},
  booktitle = {Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark, IN: JUNGHANS, A.; JENSEN, P. A. (Editors)},
  publisher = {Polyeknisk Forlag},
  address   = {Lyngby},
  pages     = {20 -- 30},
  year      = {2012},
  language  = {en}
}
@incollection{BERNHOLDKALINGLELLEK2012,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Productivity Measurement Model - A Holistic Approach For Services},
  series = {JUNGHANS, A.; JENSEN, P. A (Editors) Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark},
  booktitle = {JUNGHANS, A.; JENSEN, P. A (Editors) Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark},
  publisher = {Polyeknisk Forlag 2012},
  address   = {Lyngby :},
  pages     = {20 -- 30},
  year      = {2012},
  language  = {en}
}
@incollection{BERNHOLDKALINGLELLEK2012,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Produktivit{\"a}tsmessung von Immobilien-Services - empirische Analyse und Status Quo},
  series = {Facility Management Messe 2012 Tagungsband},
  booktitle = {Facility Management Messe 2012 Tagungsband},
  publisher = {VDE Verlag 2012},
  address   = {Berlin, Offenbach},
  pages     = {157 -- 170},
  year      = {2012},
  language  = {de}
}
@incollection{BERNHOLDKALINGLELLEK2012,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Productivity Measurement Model - A Holistic Approach For Services},
  series = {JUNGHANS, A.; JENSEN, P. A (Editors) Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark},
  booktitle = {JUNGHANS, A.; JENSEN, P. A (Editors) Proceedings of the 11th EuroFM Research Symposium, 24.-25. May 2012 in Copenhagen, Denmark},
  publisher = {Polyeknisk Forlag 2012},
  address   = {Lyngby :},
  pages     = {20 -- 30},
  year      = {2012},
  language  = {en}
}
@incollection{BERNHOLDKALINGLELLEK2012,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, M.},
  title     = {Produktivit{\"a}tsmessung von Immobilien-Services - empirische Analyse und Status Quo},
  series = {Facility Management Messe 2012 Tagungsband},
  booktitle = {Facility Management Messe 2012 Tagungsband},
  publisher = {VDE Verlag},
  address   = {Berlin, Offenbach},
  isbn      = {978-3-8007-3417-7},
  pages     = {157 -- 170},
  year      = {2012},
  language  = {de}
}