@article{Siebel1991,
  author    = {Siebel, Lothar},
  title     = {Schallschutz von Trenndecken},
  series = {DBZ Deutsche Bauzeitschrift. 39 (1991), H. 12},
  journal   = {DBZ Deutsche Bauzeitschrift. 39 (1991), H. 12},
  isbn      = {0011-4782},
  pages     = {1795 -- 1799},
  year      = {1991},
  language  = {de}
}
@article{BienerSasse1991,
  author    = {Biener, Ernst and Sasse, T.},
  title     = {Herstellen von Deponieabdichtungen},
  series = {Standard-Abdichtungssysteme f{\"u}r Deponiebauwerke : Seminarunterlagen},
  journal   = {Standard-Abdichtungssysteme f{\"u}r Deponiebauwerke : Seminarunterlagen},
  publisher = {Haus der Technik, Essen},
  address   = {Essen},
  pages     = {1 -- 17},
  year      = {1991},
  language  = {de}
}
@article{BienerSasse1991,
  author    = {Biener, Ernst and Sasse, T.},
  title     = {Altlasten-Bewertung bei Investitionsentscheidungen},
  series = {Bremer Unternehmer (1991)},
  journal   = {Bremer Unternehmer (1991)},
  pages     = {S. 27},
  year      = {1991},
  language  = {de}
}