@misc{BERNHOLDKALINGLELLEK2011,
  author    = {T. BERNHOLD and N. KALING and M. LELLEK},
  title     = {Measurement of productivity of property services: an empiric analysis of the status quo, XXI. International RESER Conference, Hamburg, 07.09.-10.09.2011},
  institution = {Oecotrophologie · Facility Management (OEF)},
  type      = {lecture},
  year        = {2011},
}