@misc{StrassnerRoehl2009,
  author    = {Strassner, C and Roehl, R.},
  title     = {Organic Certification of Hotels, Restaurants and Catering in Germany. Veranstaltung: 1st Nordic Organic Conference, G{\"o}teborg, Schweden, 18.-20.05.2009},
  year      = {2009},
  language  = {en}
}
@misc{StrassnerRoehl2009,
  author    = {Strassner, C and Roehl, R.},
  title     = {Organic certification in the iPOPY countries and Germany. Current status and future challenges Veranstaltung: iPOPY Open Seminar Providing organic school food for youths in Europe - Policy strategies, certification and supply chain management in Denmark, Finland, Italy and Norway im Rahmen des Kongressprogramms der Fachmesse BioFach, N{\"u}rnberg, 20.02.2009},
  year      = {2009},
  language  = {en}
}