@article{LukasStrassnerLoes2011,
  author    = {M Lukas and C Strassner and A-K L{\o}es},
  title     = {A need for harmonization across Europe? Certification of organic catering.},
  journal   = {Ecology \& Farming},
  number    = {Nr. 5},
  pages     = {29 -- 31},
  year      = {2011},
}