@TECHREPORT{HavranHerzogSeidel2006,
  AUTHOR = {Havran, Vlastimil and Herzog, Robert and Seidel, Hans-Peter},
  TITLE = {On Fast Construction of Spatial Hierarchies for Ray Tracing},
  TYPE = {Research Report},
  INSTITUTION = {Max-Planck-Institut f{\"u}r Informatik},
  ADDRESS = {Stuhlsatzenhausweg 85, 66123 Saarbr{\"u}cken, Germany},
  NUMBER = {MPI-I-2006-4-004},
  MONTH = {June},
  YEAR = {2006},
  ISSN = {0946-011X},
}