@incollection{HelmigBoonzaaijer2009,
  author    = {Helmig, Ilka and Boonzaaijer, Karel},
  title     = {Growing 48 hours : design experiment in an aircraft hangar ...},
  series = {Papercraft [1] : design and art with paper},
  booktitle = {Papercraft [1] : design and art with paper},
  publisher = {Gestalten Verlag},
  address   = {Berlin},
  isbn      = {978-3-89955-251-5},
  pages     = {224},
  year      = {2009},
  subject      = {Papierkunst},
  language  = {en}
}
@incollection{BoonzaaijerHelmig2009,
  author    = {Boonzaaijer, Karel and Helmig, Ilka},
  title     = {2D Room : cardboard installation},
  series = {Papercraft [1] : design and art with paper},
  booktitle = {Papercraft [1] : design and art with paper},
  publisher = {Gestalten Verlag},
  address   = {Berlin},
  isbn      = {978-3-89955-251-5},
  pages     = {206},
  year      = {2009},
  subject      = {Papierkunst},
  language  = {en}
}
@book{BoonzaaijerHelmigBergerhausenetal.2010,
  author    = {Boonzaaijer, Karel and Helmig, Ilka and Bergerhausen, Johannes and Beudaert, Matthieu},
  title     = {Vision - space for imagination},
  publisher = {Stichting Kunstboek},
  address   = {Oostkamp},
  isbn      = {978-90-5856-357-6},
  pages     = {[85] S. : zahlr. Ill.},
  year      = {2010},
  language  = {en}
}