@article{WetterElmar2008,
  author    = {Wetter, Christof and Elmar, Br{\"u}gging},
  title     = {Biogasanlagen - N{\"a}hrstoffe optimal nutzen},
  series = {VDI:Ingenieur Forum Westfalen-Ruhr},
  journal   = {VDI:Ingenieur Forum Westfalen-Ruhr},
  year      = {2008},
  language  = {mul}
}
@article{WetterElmar2008,
  author    = {Wetter, Christof and Elmar, Br{\"u}gging},
  title     = {Neue Aspekte f{\"u}r die G{\"a}rrestbehandlung},
  series = {Forum.new power},
  journal   = {Forum.new power},
  year      = {2008},
  language  = {de}
}
@article{WetterElmar2007,
  author    = {Wetter, Christof and Elmar, Br{\"u}gging},
  title     = {Leitfaden zum Bau einer Biogasanlage, Posterpr{\"a}sentation},
  series = {Biogas im Wandel,16. Jahrestagung des Fachverbandes Biogas e.V},
  journal   = {Biogas im Wandel,16. Jahrestagung des Fachverbandes Biogas e.V},
  pages     = {216},
  year      = {2007},
  language  = {de}
}
@article{WetterElmar2010,
  author    = {Wetter, Christof and Elmar, Br{\"u}gging},
  title     = {Optimierungspotenziale von Biogasanlagen},
  series = {New power forum, Ausgabe 1/2010},
  journal   = {New power forum, Ausgabe 1/2010},
  pages     = {4 -- 6},
  year      = {2010},
  language  = {de}
}
@article{WetterElmar2006,
  author    = {Wetter, Christof and Elmar, Br{\"u}gging},
  title     = {Strohheizung, Eine Alternative zu fossilen Energietr{\"a}gern},
  series = {VDI,Ingenieur Forum Westfalen-Ruhr, Ausgabe 2},
  journal   = {VDI,Ingenieur Forum Westfalen-Ruhr, Ausgabe 2},
  number    = {45620},
  pages     = {5 -- 7},
  year      = {2006},
  language  = {de}
}