@INPROCEEDINGS{Havran2007sccg-aug,
  AUTHOR = {Havran, Vlastimil and Bittner, Jiri},
  EDITOR = {Sbert, Mateu},
  TITLE = {Ray Tracing with Sparse Boxes},
  BOOKTITLE = {23rd Spring Conference on Computer Graphics (SCCG 2007)},
  PUBLISHER = {ACM},
  YEAR = {2007},
  ORGANIZATION = {ACM SIGGRAPH and EUROGRAPHICS},
  PAGES = {49--54},
  ADDRESS = {Budmerice, Slovakia},
  MONTH = {May},
}