@incollection{Helmig2013,
  author    = {Ilka Helmig},
  title     = {Tristan und Isolde, Samson und Dalila, Capriccio : 3D illustration for posters of Cologne Opera},
  booktitle = {Papercraft [1] : design and art with paper},
  editor    = {Robert Klanten},
  isbn      = {978-3-89955-251-5},
  year      = {2013},
}