@misc{Birtel2023,
  author    = {Frederick Birtel},
  title     = {Branchenindikator Instandhaltung - Ergebnisse des zweiten Quartals 2018},
  institution = {FIR e. V. an der RWTH Aachen},
  type      = {lecture},
  pages     = {13 S.},
  year        = {2023},
}