@Book{bib:Samet89a,
  author =       "H. J. Samet",
  title =        "Design and analysis of Spatial Data Structures:   
                 Quadtrees, Octrees, and other Hierarchical Methods",
  publisher =    "Addison--Wesley",
  address =      "Redding, MA",
  year =         "1989",
}

@Book{Cormen90,
 author="T.H. Cormen and C.E. Leiserson and R.L. Rivest",
 title="Introduction to Algorithms",
 isbn="ISBN 0-262-03141-8 (MIT Press), ISBN-0-07-013143-0 (McGrawHill)",
 publisher = "MIT Press",
 year="1990, tenth printing 1993",
}

@InBook{arvo89a,
        author =       "James Arvo and David Kirk",
        title =        "A survey of ray tracing acceleration techniques",
        pages =        "201--262",
        booktitle =    "An introduction to ray tracing",
        year =         "1989",
        publisher =    "Academic Press",
}