@InProceedings{Havran05sigsketch,
  author = {Vlastimil Havran and Miloslaw Smyk and Grzegorz Krawczyk
            and Karol Myszkowski and Hans-Peter Seidel},
  year = 2005,
  month = {August},
  title = {{Importance} {Sampling} for {Video} {Environment} {Maps}},
  booktitle = {{ACM} {SIGGRAPH} 2005 Full Conference {DVD}-{ROM}},
  note = {Sketches \& Applications},
  ADDRESS = {Los Angeles, USA},
  PUBLISHER    = {ACM},
  organization = {ACM SIGGRAPH},
  anote = "This is not a publication, but a presentation",
}