@incollection{WitzgallBecker2005,
  author    = {Susanne Witzgall and Lutz Becker},
  title     = {Spazierg{\"a}nge zu den Wolken. Gerhard Langs 'Cloud Walks' und Gerhard Langs Phantombilder von Wolken},
  doi       = {10.25643/bauhaus-universitaet.781},
  year      = {2005},
}