@unpublished{WilkeStahlAssawajaruwanetal.,
  author    = {Wilke, Andreas and Stahl, Katja and Assawajaruwan, Supasuda and Litterst, Kathrin},
  title     = {Induzierte Cellulaseproduktion zur Steigerung der Biogasproduktion},
  series = {Chemie Ingenieur Technik},
  volume    = {86},
  number    = {9},
  issn      = {0009-286X},
  pages     = {1389 -- 1390},
  language  = {de}
}
@unpublished{StahlSandhaasWilke,
  author    = {Stahl, Katja and Sandhaas, Anna and Wilke, Andreas},
  title     = {Development and Improvement of an enzyme producing bioreactor to enhance the methane yield in a biogas process},
  series = {Fourth Environmental Best Practices Conference},
  pages     = {38},
  language  = {en}
}