@unpublished{ChaberekSandhaasWilke2013,
  author  = {Agnieszka Chaberek and Anna Sandhaas and Andreas Wilke},
  title   = {Optimization the ratio of given biogas substrates to increase the biogas yield},
  institution = {Fakult{\"a}t Maschinenbau und Verfahrenstechnik (M+V)},
  year    = {2013},
  language  = {en}
}