@inproceedings{Buehler2004,
  author    = {Karl B{\"u}hler},
  title     = {The flow around interacting rotating spheres of different size},
  series = {11th International Symposium on Flow Visualization},
  editor    = {Ian Grant},
  publisher = {Optimage Ltd.},
  address   = {Edinburgh},
  isbn      = {0-9533991-5-X},
  pages     = {4.2.1},
  year      = {2004},
  language  = {en}
}