Efficient polyhedron intersection and union

@inproceedings{f-epiu-82,
    author = "Franklin, Wm Randolph",
    title = "Efficient polyhedron intersection and union",
    booktitle = "Proc. Graphics Interface",
    pages = "73-80",
    address = "Toronto",
    year = "1982",
    href = "\bibhref{15-gi82-xsect}",
    mykey = "topology",
    keywords = "intersection, CAD"
}