@misc {IOPORT.70561031,
    author       = {De Berg, Mark and Haverkort, Herman J.},
    title        = {Significant-presence range queries in categorical data},
    howpublished = {WADS, 462-473 (2003).},
    year         = {2003},
    doi          = {10.1007/978-3-540-45078-8_40},
    identifier   = {70561031},
}