@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{BECKERBERNHOLDBEVERUNGENetal.2013,
  author    = {BECKER, J. and BERNHOLD, T. and BEVERUNGEN, N. and KALING, N. and KNACKSTEDT, R. and LELLEK, V. and RAUER, H.},
  title     = {Softwaregest{\"u}tzte Konstruktion von Produktivit{\"a}tsmodellen im Facility Management},
  series = {THOMAS, O.; N{\"U}TTGENS, M. (Hrsg.): Dienstleistungsmodellierung 2012, Product-Service Systems und Produktivit{\"a}t},
  booktitle = {THOMAS, O.; N{\"U}TTGENS, M. (Hrsg.): Dienstleistungsmodellierung 2012, Product-Service Systems und Produktivit{\"a}t},
  edition   = {1},
  publisher = {Springer Gabler},
  address   = {Wiesbaden},
  isbn      = {978-3-658-00862-8},
  pages     = {208 -- 226},
  year      = {2013},
  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}
}
@article{BECKERBERNHOLDBEVERUNGENetal.2012,
  author    = {BECKER, J. and BERNHOLD, T. and BEVERUNGEN, D. and KALING, N. and KNACKSTEDT, R. and LELLEK, V. and RAUER, H. P.},
  title     = {Construction of Productivity Models: A Tool Supported Approach in the Area of Facility Management},
  series = {Enterprise Modelling and Information Systems Architectures},
  volume    = {7},
  journal   = {Enterprise Modelling and Information Systems Architectures},
  number    = {1},
  doi       = {10.18417/emisa.7.1.2},
  pages     = {26 -- 40},
  year      = {2012},
  language  = {en}
}
@incollection{BECKERBERNHOLDBEVERUNGENetal.2013,
  author    = {BECKER, J. and BERNHOLD, T. and BEVERUNGEN, D. and KALING, N. and KNACKSTEDT, R. and LELLEK, V. and RAUER, H.},
  title     = {Softwaregest{\"u}tzte Konstruktion von Produktivit{\"a}tsmodellen im Facility Management},
  series = {Thomas, Oliver; N{\"u}ttgens, Markus (Hg.): Dienstleistungsmodellierung 2012. Product-Service Systems und Produktivit{\"a}t.},
  booktitle = {Thomas, Oliver; N{\"u}ttgens, Markus (Hg.): Dienstleistungsmodellierung 2012. Product-Service Systems und Produktivit{\"a}t.},
  publisher = {Springer},
  address   = {Wiesbaden},
  pages     = {208 -- 226},
  year      = {2013},
  language  = {de}
}
@incollection{BERNHOLDKALINGLELLEK2011,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Produktivit{\"a}tsmessung von Dienstleistungen},
  series = {BERNHOLD, T.; GELLENBECK, K.; RIEMENSCHNEIDER, F., M{\"u}nsteraner Schriften zum Facility Management},
  booktitle = {BERNHOLD, T.; GELLENBECK, K.; RIEMENSCHNEIDER, F., M{\"u}nsteraner Schriften zum Facility Management},
  publisher = {INFA-ISFM e.V.},
  address   = {M{\"u}nster, Ahlen},
  pages     = {108 -- 122},
  year      = {2011},
  language  = {de}
}
@misc{BERNHOLDKALINGLELLEK2011,
  author    = {BERNHOLD, T. and KALING, N. and LELLEK, V.},
  title     = {Measurement of productivity of property services: an empiric analysis of the status quo, XXI. International RESER Conference, Hamburg, 07.09.-10.09.2011 2011},
  year      = {2011},
  language  = {en}
}
@misc{BECKERBERNHOLDBEVERUNGENetal.2012,
  author    = {BECKER, J. and BERNHOLD, T. and BEVERUNGEN, D. and KALING, N. and KNACKSTEDT, R. and LELLEK, V. and RAUER, H.},
  title     = {Softwaregest{\"u}tzte Konstruktion von Produktivit{\"a}tsmodellen im Facility Management, Dienstleistungsmodellierung 2012 (DLM 2012); 3. Workshop im Rahmen der Modellierung 2012, 14.-15. M{\"a}rz 2012, Otto-Friedrich-Universit{\"a}t Bamberg 2012},
  year      = {2012},
  language  = {de}
}
@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}
}